One heavy blow to the chin and the challenger went out like a light.

下巴挨了一重拳以后,挑战者立即被打得不省人事了.

《简明英汉词典》

Something swished and she went out like a light.

只听见什么东西嗖地一声,她立刻失去了知觉.

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I only hit him once and he was out like a light.

我只要用拳头击了一下他,他就昏过去了.

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He went out like a light.

他很快就睡著了.

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As soon as the lights were turned off, Tom was out like a light.

灯一灭, 汤姆就呼呼地睡着了.

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