go off (one's) dot

To become crazy or mentally unsound; to become extremely foolish or foolhardy. I'm going to go off my dot if I have to hear that blasted song once more! I think Jane's grandmother has gone off her dot lately. You must have gone off your dot if you think that's a good idea!

Common Names:

Name	Pronounced	Usage
Dicun	-	Medieval English
Pauletta	paw-LET-ə	English
Camden	KAM-dən	English (Modern)
Celio	CHE-lyo (Italian), THE-lyo (Spanish), SE-lyo (Latin American Spanish), SE-lyoo (Portuguese)	Italian, Spanish, Portuguese
Lawson	['lɔ:sn]
CennÉTig	-	Irish