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knockout + noun
表示“使失去知觉”或“决定性的”时，通常放在名词前使用。
The champion ended the fight with a knockout punch.
冠军以一记击倒性重拳结束了比赛。
击昏的；使人昏迷的
先理解核心含义，再看它在真实句子里的用法。
击昏的；使人昏迷的
That makes someone unconscious
The champion ended the fight with a knockout punch.
冠军以一记击倒性重拳结束了比赛。
常用于拳击等场景
使某人失去知觉。
Rendering someone unconscious.
令人惊叹的；迷人的；美丽的。
Amazing; gorgeous; beautiful.
指某个基因被移除或停用的生物。
Designating an organism in which a particular gene has been removed or deactivated.
导致被淘汰出比赛。
Causing elimination from a competition.
She wore a knockout dress to the party.
她穿了一件引人注目的连衣裙去参加派对。
The singer gave a knockout performance that brought the audience to its feet.
那位歌手带来了一场轰动的表演，观众都起立喝彩。
The sunset was absolutely knockout, with vibrant colors across the sky.
那片日落美得令人倾倒，天空布满了鲜艳的色彩。
表示“使失去知觉”或“决定性的”时，通常放在名词前使用。
The champion ended the fight with a knockout punch.
冠军以一记击倒性重拳结束了比赛。
这是非正式用法，表示“极美、令人惊艳”，常用在 look 等系动词后。
She looked absolutely knockout in her red dress.
她穿那条红裙子看起来惊艳极了。
Not this
He knockout the guard with one punch.
Use this
He knocked out the guard with one punch.
knockout 是形容词，不能作谓语动词；表示“把…击昏”要用动词短语 knock...out，此处应用过去式 knocked out。
Not this
The knockout boxer was carried out of the ring.
Use this
The knocked-out boxer was carried out of the ring.
形容词 knockout 表示“能击昏人的”（如 a knockout blow），不是“已被击昏的”；表示“被打昏的”要用过去分词 knocked-out 作定语。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
击倒拳
The boxer ended the fight with a knockout punch.
这名拳手以一记击倒拳结束了比赛。
决定性打击
The scandal was a knockout blow to his career.
这桩丑闻对他的职业生涯是决定性打击。
淘汰赛阶段
The team was eliminated in the knockout stage.
该队在淘汰赛阶段被淘汰。
基因敲除小鼠
Researchers used a knockout mouse to study the gene.
研究人员使用基因敲除小鼠来研究该基因。
令人惊叹的表演
She gave a knockout performance in the final.
她在决赛中奉献了令人惊叹的表演。
决定性的一击
Her final argument was the knockout punch.
她最后的论点是决定性的一击。
蒙汗药；迷药
The thief slipped knockout drops into her drink.
小偷悄悄把迷药放进了她的饮料里。
迷人的微笑
He flashed a knockout smile at the camera.
他对着镜头露出迷人的微笑。
Use knockout naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：knockout 拆成 knock（敲）+ out（出），一拳把人敲出去就是“击昏”，所以又可形容美得让人失去意识、比赛被淘汰、基因被敲除。
语域：mixed 常见场景：combat sports、informal compliments、genetics research、sports competitions knockout 作形容词时，语域随使用领域变化：在搏击、体育比赛中指“击昏的”或“淘汰的”，属中性；形容人“极美、令人惊艳”时多用于非正式场合；在遗传学中指“基因敲除的”，比较常见于专业/正式语境。实际使用时需根据语境选择合适语域。
The final syllable of 'knockout' is pronounced /aʊt/. Genuine rhymes: out, shout, about, doubt, trout. Note: 'knock' is not a rhyme—it is the first spelling part of the target and is pronounced /nɒk/ (AmE /nɑːk/). In 'doubt' the 'b' is silent.
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.