knack·er /ˈnækə $ -ər/ verb [transitiveT] British EnglishBrE spoken informal 1 TIREDto become extremely tired 使精疲力竭 SYN exhaustknacker yourself (out) Slow down – you’ll knacker yourself out! 慢点,你会累坏的!
2. knacker your elbow/hand etc spoken informal HURT/CAUSE PAINto hurt your elbow etc so that you cannot use it 使胳膊肘/手等受伤致残