knock

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knock

(nok),
1. Colloquialism for a blow, especially a blow to the head.
2. A sound simulating that of a blow or rap.
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
Unite, which represents 2,000 cabin crew, said its members had voted by nine to one to knock back a deal worth 4.8 per cent in year one and the rate of inflation for the following two years.
"He has worked so hard to come back from serious injury wants and to have this second blow is a real knock back to the lad."