knock

类型：社交聊天更新：2026-02-12

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"Knock" is a versatile English word primarily used as a verb or noun, referring to the action of striking a surface to produce sound. As a verb, it means to hit something firmly (e.g., knocking on a door) or to criticize (e.g., "knocking an idea"). As a noun, it denotes the sound produced (e.g., "a loud knock") or a setback (e.g., "taking a knock"). The term also appears in idioms like "knock on wood" (for luck) or "knock it off" (to stop). In mechanics, "engine knock" describes undesirable combustion. Its onomatopoeic quality mimics the sharp, percussive sound it represents, making it widely recognizable across contexts.

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