knock

中文： 敲击声、撞击、批评

1. An abrupt rapping sound, as from an impact of a hard object against wood. (countable, uncountable)
2. A sharp impact. (countable, uncountable) · He took a knock on the head.
3. A criticism. (countable, figuratively, informal, uncountable)
4. A blow or setback. (countable, figuratively, informal, uncountable)
5. Preignition, a type of abnormal combustion occurring in spark ignition engines caused by self-ignition; also, the characteristic knocking sound associated with it. (uncountable)
6. A batsman's innings. (countable, slang, uncountable) · He had a good knock and scored well.
7. A ball hit into play, especially one that becomes a hit. (countable, uncountable) · He played a slow but sure knock of 35.
8. Synonym of hunger knock. (uncountable)

复数 knocks