be-

prefix forming verbs:

1》 all over; all round: bespatter.

    ↘thoroughly; excessively: bewilder.

2》 (added to intransitive verbs and to adjectives and nouns) expressing transitive action: bemoan|befriend.

3》 (added to nouns) affect with: befog.

    ↘(added to adjectives) cause to be: befoul.

4》 (forming adjectives ending in -ed) having; covered with: bejewelled.

Origin

OE, weak form of bī 'by'.