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English definition of “thank you”

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thank you

exclamation uk   ( informal thanks) us  
A1 used to tell someone that you are grateful because they have given you something or done something for you: That was a delicious lunch, thank you. "Here's your coffee." "Thank you very much (indeed)." Thank you for my birthday present. said when you are answering a polite question or remark: "How are you?" "I'm fine, thank you." "You look very nice in that dress." "Thank you very much."A2 said to politely accept or refuse something that has been offered to you: "Would you like some more cake?" "Yes, I will have a small piece, thank you." "Do you need any help?" "No, thank you." said to show your disapproval of something: I don't want to hear that kind of language, thank you (very much).
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thank you

noun [C usually singular] uk   us  
B1 something that you say or do in order to show that you are grateful for something: I'd like to say a big thank you to everyone for all their help. [before noun] He wrote a thank-you note/letter to his aunt to thank her for the birthday present she sent him.
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(Definition of thank you from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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