Mishap

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Middle English: from mis-1 + hap1.

wiktionary

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From Middle English mishap, myshappe, myssehappe, equivalent to mis- +‎ hap.

From Middle English mishappen, equivalent to mis- +‎ hap.

etymonline

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mishap (n.)

mid-13c., "bad luck, misfortune, unlucky accident," from mis- (1) "bad" + hap (n.) "luck." It probably was formed on analogy of Old French mescheance (see mischance (n.)). Meaning "unfortunate event" is from mid-14c.