informal way to say no; a negative response.
A shortened, casual variant of 'no' that became popular in American English in the late 1800s. The '-pe' ending may have come from informal speech patterns or rhyming slang influences.
The word 'nope' is interesting because it sounds friendlier and less harsh than 'no,' which is why kids use it more and why it became the go-to word for casual rejection—language naturally develops softer ways to say hard things.
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