Meaning of “knacker” in the English Dictionary

"knacker" in British English

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knackerverb [ T ]

uk /ˈnæk.ər/ us /ˈnæk.ɚ/ UK slang

knacker verb [ T ] (MAKE TIRED)

to make someone very tired:

Don't go too fast or you'll knacker yourself in the first hour.

(Definition of “knacker” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)