a black and yellow flying insect that makes honey and can sting you:
a swarm of bees
a bee sting
to think something is so important, so necessary etc that you keep mentioning it or thinking about it:
Dad's got a bee in his bonnet about saving electricity.
3 American English informal
an occasion when people, usually women, meet in order to do a particular type of work
someone who enjoys being busy or active
5 spoken old-fashioned
to be very good:
She thought the party was just the bee's knees.