Main Entry: thank

Pronunciation: \ˈthaŋk\

Function: transitive verb

Etymology: Middle English, from Old English thancian; akin to Old English thanc gratitude — more at thanks

Date: before 12th century

1 : 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
2 : to hold responsible <had only himself to thank for his loss>

— thank·er noun