米已成炊

mǐ yǐ chéng chuī

lit. the rice has already been cooked (idiom)

fig. what is done cannot be undone

米

mǐ

uncooked rice

已

yǐ

already

成

chéng

short name for Chengdu 成都[Cheng2 du1]

炊

chuī

to cook food