ˈ ̷ ̷ˌ ̷ ̷ noun
( plural knock-offs )
Etymology: knock off
1. : the action of knocking off ; especially : the automatic coming to a halt of a machine or of a part of a machine through the action of a device actuated when the functioning of the machine becomes faulty
2. : a cam or other device designed to safeguard a machine or part of a machine from continuing to function when operation becomes faulty
3. : the time set for leaving off from work or from some other occupation
finished the greater part of the job long before knock-off