What does RAT mean?

Definitions for RAT

Here are all the possible meanings and translations of the word RAT.

Princeton's WordNet

  1. rat(noun)

    any of various long-tailed rodents similar to but larger than a mouse

  2. scab, strikebreaker, blackleg, rat(noun)

    someone who works (or provides workers) during a strike

  3. rotter, dirty dog, rat, skunk, stinker, stinkpot, bum, puke, crumb, lowlife, scum bag, so-and-so, git(noun)

    a person who is deemed to be despicable or contemptible

    "only a rotter would do that"; "kill the rat"; "throw the bum out"; "you cowardly little pukes!"; "the British call a contemptible person a `git'"

  4. informer, betrayer, rat, squealer, blabber(noun)

    one who reveals confidential information in return for money

  5. rat(verb)

    a pad (usually made of hair) worn as part of a woman's coiffure

  6. rat(verb)

    desert one's party or group of friends, for example, for one's personal advantage

  7. rat(verb)

    employ scabs or strike breakers in

  8. fink, scab, rat, blackleg(verb)

    take the place of work of someone on strike

  9. rat(verb)

    give (hair) the appearance of being fuller by using a rat

  10. rat(verb)

    catch rats, especially with dogs

  11. denounce, tell on, betray, give away, rat, grass, shit, shop, snitch, stag(verb)

    give away information about somebody

    "He told on his classmate who had cheated on the exam"


  1. Rat(n.)

    (Zool.) One of several species of small rodents of the genus Rattus (formerly included in Mus) and allied genera, of the family Muridae, distinguished from mice primarily by being larger. They infest houses, stores, and ships, especially the Norway rat, also called brown rat, (Rattus norvegicus formerly Mus decumanus), the black rat (Rattus rattus formerly Mus rattus), and the roof rat (formerly Mus Alexandrinus, now included in Rattus rattus). These were introduced into America from the Old World. The white rat used most commonly in laboratories is primarily a strain derived from Rattus rattus.

  2. Rat(v. i.)

    To be an informer (against an associate); to inform (on an associate); to squeal; -- used commonly in the phrase to rat on.


  1. rat(Noun)

    Any of about 56 different species of small, omnivorous rodents belonging to the genus Rattus.

  2. rat(Noun)

    A term indiscriminately applied to numerous members of several rodent families (e.g. voles and mice) having bodies longer than about 12 cm, or 5 inches.

  3. rat(Noun)

    A person who is known for betrayal; a scoundrel.

    What a rat, leaving us stranded here!

  4. rat(Noun)

    An informant or snitch

  5. rat(Noun)

    A person who routinely spends time at a particular location.

  6. rat(Noun)


  7. rat(Noun)

    North West London slang term for vagina, as in get your rat out.

  8. rat(Noun)

    A wad of shed hair used as part of a hairstyle.

  9. rat(Verb)

    to betray someone and tell their secret to an authority or an enemy; to turn someone in, bewray.

  10. rat(Verb)

    To kill rats.

  11. Origin: From rat, rotte, from ræt, from rattaz (cf. West Frisian rôt, Dutch rat, German dialect Ratz), from Hreh₃d- (cf. Welsh rhathu ‘to grate, rasp’, rodo, rostrum ‘beak, prow’, Middle Persian ‘to scrape, smooth’, Sanskrit ‘he gnaws, cuts’).

Webster Dictionary

  1. Rat(noun)

    one of several species of small rodents of the genus Mus and allied genera, larger than mice, that infest houses, stores, and ships, especially the Norway, or brown, rat (M. decumanus), the black rat (M. rattus), and the roof rat (M. Alexandrinus). These were introduced into America from the Old World

  2. Rat(noun)

    a round and tapering mass of hair, or similar material, used by women to support the puffs and rolls of their natural hair

  3. Rat(noun)

    one who deserts his party or associates; hence, in the trades, one who works for lower wages than those prescribed by a trades union

  4. Rat(verb)

    in English politics, to desert one's party from interested motives; to forsake one's associates for one's own advantage; in the trades, to work for less wages, or on other conditions, than those established by a trades union

  5. Rat(verb)

    to catch or kill rats

  6. Origin: [AS. rt; akin to D. rat, OHG. rato, ratta, G. ratte, ratze, OLG. ratta, LG. & Dan. rotte, Sw. rtta, F. rat, Ir. & Gael radan, Armor. raz, of unknown origin. Cf. Raccoon.]


  1. Rat

    Rats are various medium-sized, long-tailed rodents of the superfamily Muroidea. "True rats" are members of the genus Rattus, the most important of which to humans are the black rat, Rattus rattus, and the brown rat, Rattus norvegicus. Many members of other rodent genera and families are also referred to as rats, and share many characteristics with true rats. Rats are typically distinguished from mice by their size; rats are generally large muroid rodents, while mice are generally small muroid rodents. The muroid family is very large and complex, and the common terms rat and mouse are not taxonomically specific. Generally, when someone discovers a large muroid, its common name includes the term rat, while if it is small, the name includes the term mouse. Scientifically, the terms are not confined to members of the Rattus and Mus genera, for example, the pack rat and cotton mouse.

Chambers 20th Century Dictionary

  1. Rat

    rat, n. an animal of the genus Mus, larger and more destructive than the mouse: a renegade, turncoat: a workman who accepts lower than the authorised wages, who declines to join in a strike, or who takes a striker's work: a roll of anything used to puff out the hair which is turned over it.—v.i. (coll.) to desert one's party and join their opponents for gain or power: to take lower than current wages, to refuse to join in a strike, to take a striker's place:—pr.p. rat′ting; pa.p. and pa.t. rat′ted.ns. Rat′-catch′er, one whose business it is to catch rats; Rat′-catch′ing; Rat′-hole (print.), a pigeon-hole; Rat′-pit, an enclosure where rats are killed; Rat′-poi′son, a preparation of arsenic; Rat's′-bane, poison for rats: arsenious acid; Rat′-tail, an excrescence growing on a horse's leg.—adj. Rat′-tailed, having a tail like a rat.—ns. Rat′ter, a terrier which catches rats; Rat′tery, apostasy; Rat′ting, deserting one's principles: working for less than the usual prices: setting a dog to kill rats in a pit; Rat′-trap, a trap for catching rats.—Rat-tailed larva, the larva of certain syrphid flies.—Smell a rat, to have a suspicion. [A.S. ræt; Ger. ratte.]

Dictionary of Nautical Terms

  1. rat

    A term for one who changes his party for interest: from rats deserting vessels about to sink. These mischievous vermin are said to have increased after the economical expulsion of cats from our dockyards. Thus, in the petition from the ships-in-ordinary, to be allowed to go to sea, even to carry passengers, we read:-- "Tho' it was hemigrants or sodgers-- Anything afore them rats, Which now they is our only lodgers; For well they knows, the artful dodgers, The Board won't stand th' expense of cats." Injury done by rats is not included in a policy of insurance. Also, a rapid stream or race, derived from sharp rocks beneath, which injure the cable.

Suggested Resources

  1. rat

    Song lyrics by rat -- Explore a large variety of song lyrics performed by rat on the Lyrics.com website.

  2. RAT

    What does RAT stand for? -- Explore the various meanings for the RAT acronym on the Abbreviations.com website.

British National Corpus

  1. Nouns Frequency

    Rank popularity for the word 'RAT' in Nouns Frequency: #1603

Anagrams for RAT »

  1. tar

  2. RTA

  3. art , Art

  4. Art

How to pronounce RAT?

  1. Alex
    US English

How to say RAT in sign language?

  1. rat


  1. Chaldean Numerology

    The numerical value of RAT in Chaldean Numerology is: 7

  2. Pythagorean Numerology

    The numerical value of RAT in Pythagorean Numerology is: 3

Examples of RAT in a Sentence

  1. Walter Jones:

    When that rat hole is Afghanistan.

  2. Miguel de Cervantes:

    Thou art a cat, and a rat, and a coward.

  3. Scott Kelly:

    That would be me. I think I'm the lab rat.

  4. No Kyrgios:

    No Kyrgios match's not No Kyrgios match to rat on me.

  5. Edmund Burke:

    By gnawing through a dike, even a rat may drown a nation.

Images & Illustrations of RAT


Popularity rank by frequency of use


Translations for RAT

From our Multilingual Translation Dictionary

Get even more translations for RAT »


Find a translation for the RAT definition in other languages:

Select another language:

  • - Select -
  • 简体中文 (Chinese - Simplified)
  • 繁體中文 (Chinese - Traditional)
  • Español (Spanish)
  • Esperanto (Esperanto)
  • 日本語 (Japanese)
  • Português (Portuguese)
  • Deutsch (German)
  • العربية (Arabic)
  • Français (French)
  • Русский (Russian)
  • ಕನ್ನಡ (Kannada)
  • 한국어 (Korean)
  • עברית (Hebrew)
  • Український (Ukrainian)
  • اردو (Urdu)
  • Magyar (Hungarian)
  • मानक हिन्दी (Hindi)
  • Indonesia (Indonesian)
  • Italiano (Italian)
  • தமிழ் (Tamil)
  • Türkçe (Turkish)
  • తెలుగు (Telugu)
  • ภาษาไทย (Thai)
  • Tiếng Việt (Vietnamese)
  • Čeština (Czech)
  • Polski (Polish)
  • Bahasa Indonesia (Indonesian)
  • Românește (Romanian)
  • Nederlands (Dutch)
  • Ελληνικά (Greek)
  • Latinum (Latin)
  • Svenska (Swedish)
  • Dansk (Danish)
  • Suomi (Finnish)
  • فارسی (Persian)
  • ייִדיש (Yiddish)
  • հայերեն (Armenian)
  • Norsk (Norwegian)
  • English (English)

Discuss these RAT definitions with the community:

Word of the Day

Would you like us to send you a FREE new word definition delivered to your inbox daily?

Please enter your email address:


Use the citation below to add this definition to your bibliography:


"RAT." Definitions.net. STANDS4 LLC, 2020. Web. 27 Feb. 2020. <https://www.definitions.net/definition/RAT>.

Are we missing a good definition for RAT? Don't keep it to yourself...

Free, no signup required:

Add to Chrome

Get instant definitions for any word that hits you anywhere on the web!

Free, no signup required:

Add to Firefox

Get instant definitions for any word that hits you anywhere on the web!

Nearby & related entries:

Alternative searches for RAT:

Thanks for your vote! We truly appreciate your support.