The Collaborative International Dictionary of English v.0.48:

Befall \Be*fall"\, v. t. [imp. Befell; p. p. Befallen; p.
   pr. & vb. n. Befalling.] [AS. befeallan; pref. be- +
   feallan to fall.]
   To happen to.
   [1913 Webster]

         I beseech your grace that I may know
         The worst that may befall me.            --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Befall \Be*fall"\, v. i.
   To come to pass; to happen.
   [1913 Webster]

         I have revealed . . . the discord which befell.
                                                  --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

befall
    v 1: become of; happen to; "He promised that no harm would
         befall her"; "What has become of my children?" [syn:
         befall, bechance, betide]
    2: happen, occur, or be the case in the course of events or by
       chance; "It happens that today is my birthday"; "These things
       befell" (Santayana) [syn: happen, befall, bechance]

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "befall":
   be found, be met with, be realized, bechance, betide, 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