Definition
to become mentally unstable or to behave in a foolish or irrational way
失心疯
He nearly lost his mind when he saw his team lose.
當他看到他的球隊輸了時，他幾乎要瘋了。
My mom said she would lose her mind if I came home late again.
我媽媽說如果我再晚回家，她會瘋掉。
You canceled your whole weekend for that date? Have you lost your mind?
你為了那個約會取消了整個週末？你瘋了嗎？