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.
References in periodicals archive ?
The Home Heat Helpline said families could knock around pounds 150 a year off their heating bills by insulating their lofts, while they could cut them by a further pounds 115 a year if they had cavity wall insulation.
5% could knock around pounds 16 a month off the cost of a typical pounds 100,000 mortgage.
We were friends with Hazel's brother, Neil, who now lives in Canada, and we all used to knock around together as kids.