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Stone sober
01
someone who is not in any way affected by chemical substances or alcoholic drinks
Idiom
InformalWhat is the origin of the idiom "stone sober" and when to use it?
The idiom "stone sober" is used to describe someone who is completely sober. The origin of this expression is not definitively known, but it is thought to come from the idea that stones are unyielding and solid, similar to how a person is perceived as being firm and clear-headed when they are sober.
Examples
After a night of partying, he had to drive home and stayed stone sober to ensure his safety.
