be·tide 
(bĭ-tīd)
(bĭ-tīd)v. be·tid·ed, be·tid·ing, be·tides
v.tr.
To happen to. Used chiefly in the phrase woe betide. See Synonyms at happen.
v.intr.
To take place; befall.
[Middle English bitiden : bi-, be- + tiden, to happen (from Old English tīdan; see TIDE2).]