off one's rocker

Also, off one's nut or trolley . See off one's head.

Name	Pronounced	Usage
Yekaterina	ye-kah-tye-REE-nah, ee-kah-tee-REE-nah	Russian
Stephanie	['stefəni]
Richmal	-	English (Rare)
Koit	-	Estonian
Caj	-	Swedish, Norwegian, Danish
Annalise	-	English (Modern)