(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

plural of long on

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

plural of loved one

plural of one-nighter

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