busy
adjective
uk/ˈbɪzi/ usworking hard, or giving your attention to a particular thing:
too busy to do sth I have been far too busy to think about taking time off.
busy with sth/sb All our agents are currently busy with other customers.
busy doing sth While we were busy planning our expansion, he was planning to take over the company.
a busy man/woman/person I won't take up much of your time, because I know you're a busy woman.
full of activity or people:
a busy office/restaurant/street
The shop is always busy on Saturdays.
in a busy period, you have a lot of things to do:
a busy week/day/morning It’s been a busy week.
COMMUNICATIONS ( UK also engaged)
if a telephone line is busy, someone is using it:
I tried calling the office, but the line was busy.