noun

1. a large number of bees, led by a queen, leaving one hive for another to start a new colony
2. a colony of bees in a hive
3. a moving mass, crowd, or throng a swarm of onlookers

Etymology: ME < OE swearm, akin to Ger schwarm, prob. < IE base *swer-, to buzz > L susurrare, to hiss, whisper, sorex, Gr hyrax, shrew

intransitive verb

1. to gather and fly off in a swarm: said of bees
2. to move, collect, be present, etc. in large numbers; throng; abound
3. to be filled or crowded; teem

transitive verb