take leave of (one's) senses
To do something strange or outlandish. Have you taken leave of your senses? You can't just give up surgery to move upstate and paint landscapes!
take leave of one's senses
Fig. to become irrational. (Often verbatim with one's.) What are you doing? Have you taken leave of your senses? What a terrible situation! It's enough to make one take leave of one's senses.
take leave of your senses
go mad.take ˌleave of your ˈsenses
(informal, humorous) behave as if you are mad: You want €25 000 for it? Have you taken leave of your senses?I think my aunt has taken leave of her senses. She wants to make a will leaving all her money to a dogs’ home.