bee in one's bonnet
Something of particular interest or concern; an obsession.
He has had a bee in his bonnet ever since he heard about the problem.
ADJ
bumble, bumblebee, honey, killer | queen, worker
angry
A swarm of angry bees chased us away from the garden.
QUANT
swarm
BEE + VERB
buzz, hum
The bees hummed loudly as they moved from flower to flower in the garden.
sting (sb)
fly, swarm
Bees flew from flower to flower collecting pollen on a warm summer afternoon.