to express gratitude to (somebody)
(usu + for) to hold (somebody) responsible; to blame
He had only himself to thank for his loss
used ironically as a way of phrasing a sharp request or rebuff
I'll thank you to mind your own business!
thank God/goodness/heaven
used to express gratitude or relief for something
thank one's lucky stars
to consider oneself very fortunate
thank you
used as a conventional and polite formula for expressing gratitude
thanker noun
[Old English thancian]