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 ?
The space, including a 20' by 30' skylight in the center, required movable partitions to divide it into as many as three separate studios, a waiting/reception area, conference room, small cafe, executive office, accounting and equipment rental and storage rooms, in what the client described as a "knock dead" design.