American English

Definition of hay noun from the Oxford Advanced American Dictionary



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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(informal) a small amount of money
  3. Idioms
    hit the hay/sack (informal)
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    to go to bed
    make hay while the sun shines (saying)
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    to make good use of opportunities, good conditions, etc. while they last
    a roll in the hay (informal)
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    an act of having sex with someone
See the Oxford Advanced Learner's Dictionary entry: hay