2. sleeper a heavy horizontal timber for distributing loads.
3. sleeper any long wooden, metal, or stone piece lying horizontally, as a sill or footing.
4. sleeper any of a number of wooden pieces, laid upon the ground or upon masonry or concrete, to which floorboards are nailed.
5. sleeper an unexpected success, esp. a film or play originally ignored or considered a failure.
6. sleeper Often, sleepers. one-piece or two-piece pajamas with feet, esp. for children.
7. sleeper a piece of furniture, as a sofa, that opens up or unfolds into a bed.
8. sleeper 1 (def. 2).
Definition of 'Sleeper'
Princeton's WordNet
1. (noun)sleeper, slumberer a rester who is sleeping
2. (noun)sleeper a spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal
3. (noun)sleeper an unexpected achiever of success "the winner was a true sleeper--no one expected him to get it"
4. (noun)tie, railroad tie, crosstie, sleeper one of the cross braces that support the rails on a railway track "the British call a railroad tie a sleeper"
5. (noun)sleeping car, sleeper, wagon-lit a passenger car that has berths for sleeping
6. (noun)sleeper pajamas with feet; worn by children
7. (noun)sleeper a piece of furniture that can be opened up into a bed
8. (noun)sleeper, sleeper goby tropical fish that resembles a goby and rests quietly on the bottom in shallow water
9. (noun)sleeper an unexpected hit "that movie was the sleeper of the summer"
Definition of 'Sleeper'
Webster Dictionary
1. (noun)Sleeper one who sleeps; a slumberer; hence, a drone, or lazy person
2. (noun)Sleeper that which lies dormant, as a law
4. (noun)Sleeper an animal that hibernates, as the bear
5. (noun)Sleeper a large fresh-water gobioid fish (Eleotris dormatrix)
6. (noun)Sleeper a nurse shark. See under Nurse
7. (noun)Sleeper something lying in a reclining posture or position
8. (noun)Sleeper one of the pieces of timber, stone, or iron, on or near the level of the ground, for the support of some superstructure, to steady framework, to keep in place the rails of a railway, etc.; a stringpiece
9. (noun)Sleeper one of the joists, or roughly shaped timbers, laid directly upon the ground, to receive the flooring of the ground story
10. (noun)Sleeper one of the knees which connect the transoms to the after timbers on the ship's quarter
11. (noun)Sleeper the lowest, or bottom, tier of casks
Definitions of Sleeper 
Afrikaans: slaper
Arabic: نائِم
Bulgarian: спящ човек
Brazilian: o que dorme
Czech: spáč
German: der/die Schläfer(in)
Danish: (en) sovende
Greek: κοιμώμενος
Spanish: durmiente
Estonian: magaja
Farsi: خوابيده
Finnish: nukkuja
French: dormeur/-euse
Hebrew: אָדָם שֵיָשֵן
Hindi: सोने वाला
Croatian: spavač
Hungarian: alvó
Indonesian: orang yang tidur
Icelandic: sofandi maður
Italian: dormiente, (chi dorme)
Japanese: 眠っている人
Korean: 잠자는 사람
Lithuanian: miegantysis
Latvian: gulētājs
Malay: orang yang tidur
Dutch: slaper
Norwegian: den sovende
Polish: śpiący
Persian: خوابيده
Pashto: خوب وړى، ويديدونكى: اړم ي
Portuguese: o que dorme
Romanian: adormit
Russian: спящий
Slovak: spáč
Slovenian: spalec
Serbian: spavač
Swedish: den sovande
Thai: คนนอนหลับ
Turkish: uyuyan kişi
Taiwanese: 睡眠者
Ukrainian: сплячий
Urdu: سونے والا
Vietnamese: người ngủ
Chinese: 睡眠者
