scare the living daylights out of someone
The phrase "scare the living daylights out of someone" means to frighten or shock someone to an extreme extent. It suggests that the person becomes so terrified or startled that it feels as if their very life force, represented by the term "daylights," is being forcefully expelled from them. It emphasizes a profound and intense level of fear or shock.
An idiom is a phrase or expression that usually presents a figurative, non-literal meaning attached to the phrase. Does that sound fun? It can be!
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