Idiom of the day :- Scare the living daylight out of someone

Usage, examples and definition of the Idiom :-

An unconscious person wouldn’t be able to see anything, let alone daylight. That’s why to scare the living daylights out of someone is to scare him so badly he feels he’ll faint or lapse into unconsciousness. ‘Eeeeek, a mouse !’ Iris screamed. ‘It’s scaring the living daylights out of me !’