in use

Adjective

• currently being used
  • robots are in use throughout industry
    

• (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
    
  • receptionists' telephones are always engaged
    
  • the lavatory is in use
    
  • kept getting a busy signal
    

Related words

• Synonyms: 
  busy , engaged , in use(p)