Lose one's marbles
Else clues• If I don't write to empty my mind, I ___: Byron
• Come unglued
• Descend into dementia
• Flip
• Flip one's lid
• Flip out
• Lose control in a way
• Lose it
• Lose it and run amok
• Lose one's mind
• Lose one's sanity: 2 wds.
• Lose your marbles
• Snap
• Turn psycho