Definition of hay noun from the Oxford Advanced Learner's Dictionary

     

    hay

     noun
    noun
    BrE BrE//heɪ//
     
    ; NAmE NAmE//heɪ//
     
    [uncountable]
     
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  1. 1grass that has been cut and dried and is used as food for animals a bale of hay compare straw
  2. 2(North American English, informal) a small amount of money
  3. Word Origin Old English hēg, hīeg, hīg, of Germanic origin; related to Dutch hooi and German Heu, also to hew.Extra examples The children were playing in the hay. The freshly harvested hay was taken into the hayloft. They make hay to feed the cattle in winter.Idioms (informal) to go to bed
    make hay while the sun shines
     
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    (saying) to make good use of opportunities, good conditions, etc. while they last
    (informal) an act of having sex with somebody
See the Oxford Advanced American Dictionary entry: hay