Webster's English Dictionary

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swarm

1. swarm \'swo.(*)rm\ n [ME, fr. OE swearm; akin to OHG swaram swarm and 
   prob. to L susu]rrus hum 1: a great number of honeybees emigrating together 
   from a hive in company w ith a queen to start a new colony elsewhere; also 
   : a colony of honeybees settled in a hive 2a: a dense moving crowd  2b: an 
   aggregation of free-floating or free-swimming unicellular organisms  - usu. 
   used of zoospores
2. swarm vi 1a: to form and depart from a hive in a swarm  1b: to escape in 
   a swarm (as from a sporangium)  2a: to move or assemble in a crowd : THRONG 
    2b: to hover about in the manner of a bee in a swarm  3: to contain a 
   swarm : TEEM  : to fill with a swarm  - swarm.er n
3. swarm vb [origin unknown] : to climb with the hands and feet; specif : 
   SHIN {~R up a pole}