means A structure or colony where bees live and work together, or by extension any place buzzing with crowded, busy activity.

from From Old English 'hyf,' the name for a bee's dwelling, with relatives across the Germanic languages and possibly a deeper cousin in words meaning 'to cover' or 'arch over' — fitting, since the oldest hives were dome-shaped baskets. The sense of a frantically busy place ('a hive of activity') is a later figurative leap, borrowing the bees' famous industry as a metaphor for human bustle.