A prefix, originally the same word as by;
To intensify the meaning; as, bespatter, bestir.
To render an intransitive verb transitive; as, befall (to fall
upon); bespeak (to speak for).
To make the action of a verb particular or definite; as, beget
(to get as offspring); beset (to set around).
加于名词,形容词等之前, 形成动词而表不同意义