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| NOUN |
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| /nɒk/ |
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| 1 | the sound of someone knocking on a door 敲门声 |
| +on/at There was a loud knock at the door. 传来一声很响的敲门声。 |
| | 1a | a series of noises that an engine or machine makes when it is not working correctly （发动机或机器出故障时发出的）一连串爆震声 | |
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| 2 | an injury or damage caused by being knocked 撞伤；撞坏之处 |
| a nasty knock on the head 头部严重的撞伤 |
| | 2a | an instance of knocking someone or something 碰；敲；撞 | | The watch is built to withstand the occasional knock. 这表能经受偶尔的碰撞。 | |
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| 3 | something bad or unpleasant that happens to someone 不幸；挫折 |
| hard knocks Life is full of hard knocks. 生活充满了磨难。 |
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