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.
   [1913 Webster]

         What will betide the few ?               --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Betide \Be*tide"\, v. i.
   To come to pass; to happen; to occur.
   [1913 Webster]

         A salve for any sore that may betide.    --Shak.
   [1913 Webster]

   Note: Shakespeare has used it with of. "What would betide of
         me ?"
         [1913 Webster] Betime

WordNet (r) 3.0 (2006):

betide
    v 1: become of; happen to; "He promised that no harm would
         befall her"; "What has become of my children?" [syn:
         befall, bechance, betide]

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "betide":
   be found, be met with, be realized, bechance, befall, break,
   chance, come, come about, come along, come down, come off,
   come to pass, come true, develop, eventuate, fall, fall out, go,
   go off, hap, happen, happen along, happen by chance, hazard, occur,
   pass, pass off, pop up, take place, transpire, turn up