Be-

  1. To intensify the meaning; as, bespatter, bestir.
  2. To render an intransitive verb transitive; as, befall (to fall upon); bespeak (to speak for).
  3. To make the action of a verb particular or definite; as, beget (to get as offspring); beset (to set around).

It is joined with certain substantives, and a few adjectives, to form verbs; as, bedew, befriend, benight, besot; belate (to make late); belittle (to make little). It also occurs in certain nouns, adverbs, and prepositions, often with something of the force of the preposition by, or about; as, belief (believe), behalf, bequest (bequeath); because, before, beneath, beside, between. In some words the original force of be is obscured or lost; as, in become, begin, behave, behoove, belong.