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go off (one's) rocker
To become crazy or mentally unsound; to become extremely foolish or foolhardy. I'm going to go off my rocker if I have to hear that blasted song once more! I think Jane's grandmother has gone off her rocker lately. You must have gone off your rocker if you think that's a good idea!
be off (one's) rocker
To be crazy or mentally unsound; to be extremely foolish or foolhardy. I think Jane's grandmother is a little off her rocker these days. You must be off your rocker if you think that's a good idea!
off (one's) rocker
Crazy; mentally unsound; extremely foolish. I'm going to go off my rocker if I have to hear that song one more time! I think Jane's grandmother is a little off her rocker these days. You must be off your rocker if you think that's a good idea!
*off one's rockerand *off one's nut; *off one's trolley
Fig. crazy; silly. (*Typically: be ~; go ~.) Sometimes, Bob, I think you're off your rocker. Good grief, John. You're off your nut.
off one's head
Also, off one's nut or rocker or trolley or chump . Crazy, out of one's mind, as in You're off your head if you think I'll pay your debts, or I think Jerry's gone off his nut over that car, or When she said we had to sleep in the barn we thought she was off her rocker, or The old man's been off his trolley for at least a year. The expression using head is colloquial and dates from the mid-1800s, nut has been slang for "head" since the mid-1800s; rocker, dating from the late 1800s, may allude to an elderly person falling from a rocking chair; trolley, also dating from the late 1800s, may be explained by George Ade's use of it in Artie (1896): "Any one that's got his head full of the girl proposition's liable to go off his trolley at the first curve." The last, chump, is also slang for "head" and was first recorded in 1859.
off one's rocker
Also, off one's nut or trolley . See off one's head.
off your rockerINFORMAL
If someone is off their rocker, they are crazy. He must be off his rocker, paying that much for a shirt! Note: You can also say that someone goes off their rocker to mean that they become crazy. Sometimes I think he's going off his rocker.
off your rockercrazy. informal
A rocker in this expression is a concave piece of wood or metal placed under a chair or cradle enabling it to rock back and forth.
1932 Evelyn Waugh Black Mischief It's going to be awkward for us if the Emperor goes off his rocker.
ˌoff your ˈrocker(informal, spoken, especially British English) (of a person) crazy: Spend a thousand pounds on a dress! Are you off your rocker?
off one’s rocker
mod. silly; giddy; crazy. (see also rocker.) That silly dame is off her rocker.
1. n. a rocking chair. (Not slang.) I love to spend a sunny afternoon in my rocker.
2. n. a rock and roll singer, song, or fan. (see also off one’s rocker.) Let’s listen to a good rocker.
off (one's) rockerSlang
Out of one's mind; crazy.