(colloquial, rhetorical question) A reply to an unimportant or irrelevant statement, indicating indifference on the part of the speaker.

(colloquial) Who says so; on whose authority?

Asks the interlocutor for their identification

(informal) A marathon of the British science-fiction series Doctor Who.

plural of Who-athon

A sentry's challenge to an intruder.

Expressing surprise, or ironic lack of surprise, upon learning something.

Alternative form of whoso

(politics) Who will defeat or dominate whom? A Bolshevist principle or slogan, urging action against the capitalists.

(idiomatic, somewhat dated, Britain, Ireland, New England) A rebuke especially directed towards children for having referred to a woman as "she", instead of using her name or an appropriately respectful title.