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Douglas Harper's Etymology Dictionary
misbefall

"suffer harm, come to grief," mid-13c., from mis- (1) + befall. Related: Misbefell; misbefalling.

Wiktionary
misbefall

vb. 1 (context transitive obsolete English) Of an event, to happen unfortunately to (a person). 2 (context intransitive obsolete English) Of an event, to happen unfortunately.