(informal) The state or condition of being a loser. / (informal) The world or sphere of losers.

(idiomatic) To become upset or disconcerted; to lose one's temper.

(mathematics) With a constraining assumption that, however, makes it clear how to apply the proof performed under this assumption to the general case unconstrained by the assumption.

(obsolete) simple past tense and past participle of lose / (obsolete) simple past tense and past participle of loose

To forget one's train of thought or temporarily misplace an item or its place in a sequence.

present participle of lose track

Third-person singular simple present indicative form of lose track

simple past tense and past participle of lose track

simple past tense and past participle of lose it

Third-person singular simple present indicative form of lose it