1. (n.)groan a low, mournful sound uttered in pain or grief.
2. groan a deep, inarticulate sound uttered in derision, disapproval, etc.
3. groan a deep grating or creaking sound due to a sudden or continued overburdening, as with a great weight.
4. (v.i.)groan to utter a deep, mournful sound expressive of pain or grief; moan.
5. groan to make a deep, inarticulate sound expressive of derision, disapproval, etc.
6. groan to make a sound resembling a groan; resound harshly: The steps of the old house groaned under my weight.
7. groan to be overburdened or overloaded.
8. (v.t.)groan to utter or express with groans.
Etymology: (bef. 900; ME gronen, OE grānian, c. OHG grīnan to grimace)
Definition of 'Groan'
Princeton's WordNet
1. (verb)groan, moan an utterance expressing pain or disapproval
2. (verb)groan, moan indicate pain, discomfort, or displeasure "The students groaned when the professor got out the exam booklets"; "The ancient door soughed when opened"
1. (verb)groan to make a long low sound We all groaned at the thought of the work to be done.; The wind groaned in the trees.
Definition of 'Groan'
Webster Dictionary
1. (noun)Groan a low, moaning sound; usually, a deep, mournful sound uttered in pain or great distress; sometimes, an expression of strong disapprobation; as, the remark was received with groans
2. (verb)Groan to give forth a low, moaning sound in breathing; to utter a groan, as in pain, in sorrow, or in derision; to moan
3. (verb)Groan to strive after earnestly, as with groans
Sense: to produce a deep sound (because of pain, unhappiness etc) He groaned when he heard that he had failed his exam; The table was groaning with food (= there was a great deal of food on it).
Definitions of Groan 
Afrikaans: kreun, sug, kerm, steun
Arabic: يَئِنُّ
Bulgarian: стена
Brazilian: gemer
Czech: (za)sténat, povzdechnout
German: stöhnen, ächzen
Danish: stønne; bugne
Greek: βογγώ
Spanish: gemir; gruñir
Estonian: oigama,ägama
Farsi: نالیدن
Finnish: vaikeroida
French: gémir
Hebrew: לְהֵיאָנַח
Hindi: कराहना
Croatian: stenjanje, gunđanje
Hungarian: nyög; sóhajt
Indonesian: menggeram
Icelandic: andvarpa, stynja
Italian: gemere; scricchiolare
Japanese: うめく
Korean: 끙끙거리다, 신음하다
Lithuanian: (su)dejuoti, vaitoti
Latvian: vaidēt; stenēt; līkt/lūzt
Malay: mengerang
Dutch: kreunen, kermen; kraken
Norwegian: stønne, bære seg
Polish: jęczeć
Persian: نالیدن
Pashto: زګيروى كول: ويركول: خواشي
Portuguese: gemer
Romanian: a geme
Russian: стонать; ломиться (под тя
Slovak: (za)stonať
Slovenian: ječati
Serbian: stenjati
Swedish: stöna, jämra sig, digna a
Thai: คราง
Turkish: inlemek
Taiwanese: 呻吟
Ukrainian: стогнати
Urdu: کراہنا
Vietnamese: rên rỉ
Chinese: 呻吟
