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: to tell (someone) that you are grateful for something that he or she has done or given
Full Definition of THANK
: to express gratitude to <thanked her for the present> —used in the phrase thank you usually without a subject to politely express gratitude <thank you for your consideration> or sometimes to emphasize a preceding statement especially by implying that it is not subject to question <likes her job just fine, thank you> —used in such phrases as thank God, thank goodness usually without a subject to express gratitude or more often only the speaker's or writer's pleasure or satisfaction in something
: to hold responsible <had only himself to thank for his loss>
Examples of THANK
I want to thank everyone who helped today.
There's no need to thank me. Anyone would have done the same.
Origin of THANK
Middle English, from Old English thancian; akin to Old English thanc gratitude — more at thanks