Definition of thank you exclamation from the Oxford Advanced American Dictionary

      

    thank you

     exclamation
    exclamation
     
    see also thanks
     
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  1. 1used to show that you are grateful to someone for something they have done thank you (for something) Thank you for your letter. thank you (for doing something) Thank you so/very much for sending the photos.
  2. 2a polite way of accepting something that someone has offered you “Would you like some help with that?” “Oh, thank you.”
  3. 3no thank you a polite way of refusing something that someone has offered you “Would you like some more cake?” “No thank you.”
  4. 4used at the end of a sentence to tell someone firmly that you do not need their help or advice “I can do that for you.” “I can do it myself, thank you.”
See the Oxford Advanced Learner's Dictionary entry: thank you