a actively or fully engaged or occupied
busy with her work a busy man too busy to eat lunch
s overcrowded or cluttered with detail
a busy painting
s intrusive in a meddling or offensive manner
busy about other people's business
s crowded with or characterized by much activity
a very busy week a busy life a busy street a busy seaport
s (of facilities such as telephones or lavatories) unavailable for use by anyone else or indicating unavailability; (`engaged' is a British term for a busy telephone line)
her line is busy kept getting a busy signal