Words of gratitude (5,3)

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5,3

thank you

'words of gratitude' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for thank you that I've seen before include "Polite acknowledgment" , "Much obliged!" , "Cheers" , "show appreciation" , "Concentional expression of appreciation" .)

I've seen this clue in The Independent and The Times.

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