The origin of the idiom "off one's rocker" is not entirely clear, but it likely comes from the idea of a rocking chair.  When someone is "off their rocker," it means they have lost their balance or stability, much like a rocking chair that is no longer balanced and wobbles unpredictably. It is used to describe someone who is behaving in a crazy, irrational, or mentally unstable manner.

What is the origin of the idiom "off one's rocker" and when to use it?

Определение и значение слова «off one's rocker» на английском языке

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