swarming
verb
Meaning
To move as a swarm.
To teem, or be overrun with insects, people, etc.
To fill a place as a swarm.
To overwhelm as by an opposing army.
To climb by gripping with arms and legs alternately.
To breed multitudes.
noun
Meaning
The motion of a swarm.
A crime where an unsuspecting innocent bystander is attacked by several culprits at once, with no known motive.