The living daylights (idiom)
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The earliest recorded reference to this term comes from the 1752 novel Amelia by Henry Fielding, in which a character states his readiness to physically assault a particular woman: "If the lady says another such words to me ... I will darken her daylights."
The idiom is now generally used only as part of a wider expression to express intensity in a negative manner, most commonly in the form "to scare the living daylights out of someone" or "to beat the living daylights out of someone."