bustling

Concise Oxford English Dictionary © 2008 Oxford University Press:
bustle1

▶verb move in an energetic and busy manner.

■ (often as adj. bustling) (of a place) be full of activity.

▶noun excited activity and movement.

– origin ME: perh. a var. of obs. buskle, frequentative of busk ‘prepare’, from ON.

Concise Oxford English Dictionary © 2008 Oxford University Press:
bustle2

▶noun historical a pad or frame worn under a skirt to puff it out behind.

– origin C18: of unknown origin.