knacker
verb [ T ] UK slang uk/ˈnæk.ər/ us/ˈnæk.ɚ/
(BREAK)
弄坏
to break something
Careful or you'll knacker the gears! 小心点，不然你会弄坏汽车的传动装置！
(MAKE TIRED)
使筋疲力尽
to make someone very tired
Don't go too fast or you'll knacker yourself in the first hour. 别走得太快，不然你头一个小时就疲惫不堪了。