Synonyms for Betide:

n.

come. come off, develop, hap, pass, transpire, come about. betide (noun)
befall, bechance.

v.

develop (verb)
transpire, befall.

Other synonyms:

transpire. develop. come. pass. happen
come.
Other relevant words:
pass, come about, develop, befall, transpire, come, come off, hap.

Usage examples for betide

  1. Woe betide the careless seaman who might lose his balance aloft, and drop within reach of the creature's jaws. – The Three Lieutenants by W.H.G. Kingston