The Collaborative International Dictionary of English v.0.48:

Betide \Be*tide"\ (b[-e]*t[imac]d"), v. t. [imp. & p. p.
   Betided, Obs. Betid; p. pr. & vb. n. Betiding.] [OE.
   bitiden; pref. bi-, be- + tiden, fr. AS. t[imac]dan, to
   happen, fr. t[imac]d time. See Tide.]
   To happen to; to befall; to come to; as, woe betide the
   wanderer.
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         What will betide the few ?               --Milton.
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