In Use (Adjective)
Meaning 1
Currently being used; "robots are in use throughout industry".
Classification
All adjective clusters.
Meaning 2
(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".
Classification
All adjective clusters.