off one's rocker
Lost one's marbles
Off one's rocker means crazy or mentally unbalanced.
The rocker is the curved base of a rocking chair—to be off it suggests instability or upset equilibrium.
The phrase is informal and usually mild, more dismissive than clinical: You're off your rocker if you think I'm paying that much.
Has Grandpa gone off his rocker?
- bonkersWildly irrational, unhinged
- cuckooBrood parasite bird
- mad as a hatterCompletely, absurdly insane
- unhingedMentally or emotionally unstable
- nuttyEccentric or almond-flavored
off one's trolley · mad · stark raving mad · batty · wacky · loopy · nutty as a fruitcake · zany · barking mad · insane · round the bend · out of one's mind · out of one's tree · deranged · lunatic · out to lunch · not all there · cracked up
off one's rockersane
Mentally healthy, clearheaded
lucid · of sound mind · in one's right mind · rational · compos mentis
off one's rockerreasonable
Showing sound judgment
sensible · down-to-earth · pragmatic · logical · sound