busy bee

:  engaged in action :  occupied

:  being in use

:  full of activity :  bustling

:  to make engaged in action :  to make busy (see ¹busy 1a) :  occupy

:  bustle

:  any of numerous hymenopterous insects (superfamily Apoidea) that differ from the related wasps especially in the heavier hairier body and in having sucking as well as chewing mouthparts, that feed on pollen and nectar, and that store both and often also honey — see africanized bee, bumblebee, carpenter bee, honeybee, sweat bee

:  an eccentric notion :  fancy

:  the letter b

:  a gathering of people for a specific purpose