be-
/bi/prefix
Forming verbs:
1All over; all round: bespatter
1.1Thoroughly; excessively: bewilder
2(Added to intransitive verbs) expressing transitive action: bemoan
3(Added to adjectives and nouns) expressing transitive action: befool befriend
4(Added to nouns) affect with: befog
4.1(Added to adjectives) cause to be: befoul
5(Forming adjectives ending in -ed) having; covered with: bejewelled
Origin
Old English, weak form of bī 'by'.