To Betide

1. (transitive) Often used in a prediction (chiefly in woe betide) or a wish: to happen to (someone or something); to befall.
2. (intransitive) Chiefly in the third person: to happen; to take place; to bechance, to befall. Synonyms: (archaic) betime, come to pass, occur, (obsolete) tide, transpire; happen