Past Tense of “lose”
The past tense of lose is lost; the past participle is lost.
Why “lose” behaves this way
"Lose" comes from Old English "losian" (to perish, to be lost), itself related to the adjective "los" meaning "loose, free" — the underlying ancient sense was something becoming detached or set free from your grasp, which is why "lose" and "loose" are genuine, if distant, etymological cousins rather than a purely coincidental sound-alike pair, even though modern English treats them as completely unrelated in everyday use. The consonant and vowel changes that produced "lost" from "losian" follow the same general devoicing and shortening pattern seen in other English verbs that settle into a "-t"-ending past tense.
Despite their shared ancient root, "lose" (verb, rhymes with "shoes") and "loose" (adjective, rhymes with "goose," meaning not tight or not confined) have drifted so far apart in modern pronunciation and grammatical role that virtually no native speaker perceives them as related today — the connection survives only as a linguistic curiosity, not as a living sense any modern speaker would intuit.
The common confusion
The overwhelming real-world confusion with this word is spelling "lose" as "loose" or vice versa in writing — "I don't want to loose my job" instead of the correct "lose" — one of the most frequent spelling errors in English precisely because the words are historically related, similarly spelled, but now function completely differently (one a verb, one an adjective) and sound different enough that the error is purely a written, not spoken, mistake.
How it's actually used
"Lose" extends into a wide range of abstract senses beyond misplacing objects — lose weight, lose an argument, lose interest, lose your train of thought — all sharing the identical lost/lost conjugation while covering physical, competitive, emotional, and cognitive domains. The idiom "lose it" (meaning to lose emotional control, or sometimes composure through laughter) is a distinctly informal, context-dependent extension that requires surrounding cues to disambiguate its meaning. Investment and gambling vocabulary treats "lose" as the default antonym of "win" or "gain" across an enormous range of fixed phrases — lose money, lose a bet, lose ground — all sharing the identical lost/lost conjugation regardless of financial stakes.
Across the tense system
"Lost" functions independently as an adjective describing a state, separate from any sentence about an act of losing something — "a lost cause," "lost in thought," "the lost city" — uses so common that a reader rarely traces them back to a specific prior event of misplacing anything, which sets this adjectival use apart from the ordinary perfect-tense participle in a sentence like "she has lost her phone."
Common real mistakes
The single most frequent error connected to this verb, by far, is misspelling it as "loose" ("I don't want to loose the game"), a mistake common even among fluent writers since the two words are historically related and superficially similar, even though they now sound and function differently — spellcheckers won't catch it since "loose" is a correctly spelled word on its own. A separate but rarer error is "losed" as a nonstandard regularized past tense, occurring mainly among very early learners. A further genuine mix-up is "lose" versus "miss" when describing an opportunity — English says "miss a flight" or "miss a chance," reserving "lose" for something you once possessed and no longer have, a distinction that trips up learners translating directly from languages that use one broader verb for both senses. A further easily overlooked distinction is "lose" versus "waste": English reserves "lose" for something that existed and then slipped away, while "waste" describes squandering a resource that was never actually taken from you.
Examples
- She lost her keys somewhere in the park.
- They have lost three games in a row.
- He lost his temper during the meeting.
- We had lost track of time completely.
- The team loses more often on the road.
- Don't lose sight of the goal.
- She's losing patience with the delays.
- Nothing was lost in translation.
Memory trick
Remember "lose" has one "o" and rhymes with "shoes" (something you could genuinely lose), while "loose" has two "o"s and rhymes with "goose" (a loose, roomy shirt) — a simple spelling-and-rhyme anchor that keeps the historically related but now functionally unrelated words apart on the page.