Nope
来自Big Physics
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wiktionary
Representing no pronounced with the mouth snapped closed at the end. Compare yep and welp.
Probably a rebracketing of an ope (see 1823 quote), from alp.
Possibly influenced by nape and knap.
etymonline
nope (adv.)
1888, emphatic form of no, with emphasis on the closing of the lips.