be- [bı] prefix
[: Old English; Origin: bi-, be-]
1.) [in verbs]
used to mean that someone or something is treated in a particular way
Don't belittle him (=say he is unimportant) .
He befriended me (=became my friend)
2.) literary [in adjectives]
wearing or covered by a particular thing
a bespectacled boy (=wearing glasses)

Dictionary of contemporary English. 2013.