busybus·y /ˈbɪzi/ adjectiveadj1American EnglishAmE a telephone that is busy is being usedSYN BrE engaged 2someone who is busy is working and is not availableMr Bullon is busy right now - can you phone back after lunch?
busy with
I’ve been busy with customers all morning
3COMMERCEa busy period is full of workChristmas is one of Oxford Street’s busiest times of the year.