Bechance

From - + chance.

Full definition of bechance

Verb

1. (intransitive) To happen; chance.
2. (transitive, archaic) To happen (to); befall to.
• 1594, Shakespeare, .Disturb his hours of rest with restless trances, Afflict him in his bed with bedrid groans; Let there bechance him pitiful mischances, To make him moan; but pity not his moans: Stone him with harden'd hearts, harder than stones

From -("by") + chance.

Adverb

1. Accidentally; by chance.