A bustling place or situation has a lot of energy and activity going on. People are often moving around quickly.
When we describe something as bustling, we usually mean that it's busy with many people doing different things at the same time. For example, a big city street during rush hour is probably bustling - there are cars honking, people walking in all directions, and maybe even some construction work going on. Or think about a holiday market: vendors shouting to get your attention, customers browsing through stalls, and music playing in the background - that's a pretty typical example of a bustling atmosphere.
Busy; full of energy and noisy activity.
Example: bustling marketplace
