American English

Definition of thank you noun from the Oxford Advanced American Dictionary

  

thank you

 noun
noun
 
[usually singular] thank you (to somebody) (for something)
 
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 an act, a gift, a comment, etc. intended to thank someone for something they have done The actor sent a big thank you to all his fans for their letters of support. She took the money without so much as a thank you. a thank-you letter
See the Oxford Advanced Learner's Dictionary entry: thank you