Definition of off one's rocker in US English:

off one's rocker

phrase

informal
  • Insane.

    • ‘When his attempts to do so fail miserably, Phillip starts to go off his rocker.’
    • ‘So anybody who comes along and says we didn't explain there were some risks is off their rocker.’
    • ‘While I think the Irwin family is off their rockers, I do believe they make for great television.’
    • ‘Dressed in the gaudiest of outfits and wearing a wig that appears to be made out of 13 poodles, Dennis is adorably loony and off her rocker.’
    • ‘When I got back home, my friends thought I was off my rocker.’
    • ‘For a minute there, before I realized the woman was off her rocker, I was scared.’
    • ‘You might have been considered off your rocker to buy one of these modernist homes.’
    • ‘Lest you think me completely off my rocker, I should explain that I'm judging this movie as what it is, a kids' movie.’
    • ‘To go in the ring and have it not faze you to be so severely punished like that, you have to be a bit off your rocker.’
    • ‘Some think that she's fallen off her rocker as her training schedule runs up to 14 practices a week.’
    severely mentally ill, mentally ill, insane, mad, certifiable, deranged, demented, of unsound mind, out of one's mind, not in one's right mind, not together, crazed, maniac, maniacal, lunatic, unbalanced, unhinged, unstable, disturbed, distracted, stark mad, manic, frenzied, raving, distraught, frantic, hysterical, delirious, mad as a hatter, mad as a march hare
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