lose one's mind
Definition of lose one's mind
: to become mentally ill : to go insane I feel like I'm losing my mind.
Word by Word Definitions
: to miss from one's possession or from a customary or supposed place
: to suffer deprivation of : part with especially in an unforeseen or accidental manner
Seen and Heard
What made you want to look up lose one's mind? Please tell us where you read or heard it (including the quote, if possible).