1.Definition: (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"
2.Definition: actively or fully engaged or occupied
"Busy with her work", "A busy man", "Too busy to eat lunch"
3.Definition: crowded with or characterized by much activity
"A very busy week", "A busy life", "A busy street", "A busy seaport"
4.Definition: intrusive in a meddling or offensive manner
"Busy about other people's business"
5.Definition: overcrowded or cluttered with detail
"A busy painting"