ごちそうさま
ごちそうさま · gochisousama · JLPT N2 · expression
Thank you for the meal
🍽️ ご (honorific) + 馳走 (feast) + さま (honorific) = thanks for the honored feast
馳走 (chisou) originally meant running about to prepare a lavish feast. Said after a meal to thank the host, and the honorifics ご and さま make it polite.