A hive of activity

Meaning

A place that is very busy and full of people working.

Examples

• John: Wow, look at all those people at the conference.
• Alice: It’s absolutely <b>a hive of activity</b> in there!
• John: I can't believe how busy they all are. It's amazing!
• Alice: It really is <b>a hive of activity</b>. I’ve never seen so many people networking.