Here's why:
* Figurative Language: It uses a metaphor, comparing the busy, energetic atmosphere of a class to a beehive, where bees are constantly moving and working.
* Meaning: The idiom means that the classroom is very lively and full of activity, with students talking, moving around, and participating in the lesson.
* Common Usage: This idiom is used to describe a classroom environment where there is a lot of energy and excitement.
Let me know if you have any other idioms you'd like to explore!