thank-you

[ thangk-yoo ]
/ ˈθæŋkˌyu /

adjective

expressing one's gratitude or thanks: a thank-you note.

noun

an expression of thanks, as by saying “thank you”: I never got so much as a thank-you for helping him.

Origin of thank-you

1785–95 for def 2; noun and adj. use of verb phrase thank you
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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