A matter of indifference; a matter having no importance or consequence.

(formal) In place of someone or something.

(colloquial, only with a negative) Even if one's (own) life depended on it; at all.

(literally) Onto or into someone's face. / (idiomatic) In front of someone's face; before someone's eyes.

(informal) In one's opinion. / Used other than figuratively or idiomatically: see in, one's, book.

(idiomatic, colloquial, dated) To drink alcohol excessively, to the point of being drunk

To the extent of one's limited knowledge of the facts.

plural of one-nighter

Synonym of one-night stand (single evening's performance) / Synonym of one-night stand (single sexual encounter)

(idiomatic, chiefly Northern England) on one's own, alone