to take leave of one's senses
01
to start thinking or acting in a way that seems foolish
![to [take] leave of {one's} senses definition and meaning](https://cdn.langeek.co/photo/42148/original/?type=jpeg "to [take] leave of {one's} senses definition and meaning")
Idiom
Informal
Old use
例
I ca n't believe he invested all his savings in that risky scheme; he must have taken leave of his senses.
When she started yelling at her boss during the meeting, it was clear she had taken leave of her senses.
