You shouldn't be upset over something that can't be undone.

Alternative form of there's no point crying over spilt milk

Alternative form of don't teach your grandmother how to suck eggs

Do not expect somebody to make a costly commitment if it will give them nothing they do not already have; used especially as a warning against having sexual intercourse before marriage.

An animal, such as a dairy cow, kept for the milk it produces. / A person who milks. / A milking machine. / (poker) A conservative poker player who only raises the stakes on a good hand.

plural of milker

(archaic) second-person singular simple present form of milk

(archaic) Third-person singular simple present indicative form of milk

(rare or archaic) Consisting of milk. / (rare) Milky; resembling milk.

plural of share milker