knockyourselfout
—phrasal verbwithknockverbuk/nɒk/us/nɑːk/
to make yourselfunconscious, usually byhittingyourhead
（尤指因为撞到头部）使自己不省人事
Shehitherheadon theceilingandknockedherself out.她的头撞在天花板上，昏了过去。
informal
to make yourselfillwithtiredness
使筋疲力尽
If youcarryonworkinglike this, you'llknockyourself out.如果你继续这么干下去，会累垮的。