(slang, Britain) A whatsit; a thing which the speaker is unable or unwilling to specify more precisely. / (slang, Britain, euphemistic) Sexual intercourse.

(US military) the father of a member of the U.S. armed forces who was killed in action

plural of gold star father

One could be someone's parent, said of a man older than a woman.

(humorous, rare) Bob's your uncle

Alternative form of like father, like son

past participle of be gathered to one's fathers

present participle of be gathered to one's fathers

A son will have traits similar to his father upon reaching adulthood.

(idiomatic, colloquial, humorous) A notional look of anticipation or hope (either for sex or a child) in one's father's eyes at or around the time of one's conception.