knack‧er /ˈnækə $ -ər/
verb [transitive] British English spoken informal[
Date: 1800-1900;
Origin: knacker 'horse-killer'; KNACKERS' YARD]
1. to become extremely tired
Synonym : exhaustknacker yourself (out)
Slow down – you’ll knacker yourself out!2. knacker your elbow/hand etc to hurt your elbow etc so that you cannot use it
[TahlilGaran] Dictionary of Contemporary English ▲