lose one's mind
https://gyazo.com/90886bb380170875caf178b538719797
source:
Shion Higurashi GIF - Shion Higurashi Laughing - Discover & Share GIFs
lose
one's
mind
(or
lose one's marbles
)
informal
go
insane
.
気が狂う; ｟くだけて｠ 頭がおかしくなる
#collocation