English definition of “busy”
PERSON › If you are busy, you are working hard, or giving your attention to a particular activity: Mum was busy in the kitchen. [+ doing sth] I was busy mowing the lawn. I've got plenty of jobs to keep you busy. He was too busy talking to notice us come in.
PLACE › A busy place is full of activity or people: a busy restaurant/road
TIME › In a busy period you have a lot of things to do: I've had a very busy week.
TELEPHONE US (UK engaged) › If a telephone line is busy, someone is using it.