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Word: knock
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Meaning:
Noun:
- An abrupt rapping sound, as from an impact of a hard object against wood
- An impact.
- automotive A type of abnormal combustion occurring in spark ignition engines. Normally a flame front advances progressively out from the spark, but when knock occurs unburnt air/fuel ahead of the flame self-ignites under the heat and pressure, producing a characteristic knocking sound and a sudden further increase in pressure which can be very damaging to the engine.
- cricket a batsman's innings.
Source: Wiktionary
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Verb:
- colloquial To denigrate, undervalue.
- To bump or impact.
- To rap one's knuckles against something, especially wood.
Source: Wiktionary
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