Definition of cow noun from the Oxford Advanced American Dictionary

      

    cow

     noun
    noun
    NAmE//kaʊ//
     
     
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  1. 1a large animal kept on farms to produce milk or beef cow's milk a herd of dairy cows (= cows kept for their milk) compare bull, calf, heifer see also cattle
  2. 2the female of the elephant, whale, and some other large animals compare bull
  3. 3(slang) (disapproving) an offensive word for a woman You stupid cow! That interfering old cow has never liked me. see also cash cow, sacred cow
  4. Idioms
    have a cow(informal)
     
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    to become very angry or anxious about something Don't have a cow—it's no big deal.
    till the cows come home(informal)
     
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    for a very long time; for ever You can talk till the cows come home—you'll never make me change my mind.
See the Oxford Advanced Learner's Dictionary entry: cow