(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 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

(idiomatic, informal) A chance to find out something interesting about someone. / (idiomatic, informal) A chance to fight with someone.

(nonstandard) eleven

(idiomatic, obsolete) For one's part; as far as one is concerned.