in use

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

1. (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) (Freq. 3)
- her line is busy
- receptionists' telephones are always engaged
- the lavatory is in use
- kept getting a busy signal
• Syn:
busy, engaged
• Similar to:
occupied
• Derivationally related forms:
busyness (for: busy)
2. currently being used (Freq. 2)
- robots are in use throughout industry
• Similar to:
used