mischance (n.)

"mishap, ill-luck, disaster," c. 1300, from Old French mescheance "misfortune, mishap, accident; wickedness, malice," from Vulgar Latin *minuscadentiam; see mis- (2) + chance (n.). Now usually "bad luck;" formerly much stronger: "calamity, disaster, affliction."

"to happen wrongly or unfortunately," 1540s, from mis- (1) + chance (v.). Related: Mischanced; mischancing.