in use

in use (http://definr.com/in use)

     adj 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); "her line is busy"; "receptionists' telephones
            are always engaged"; "the lavatory is in use"; "kept
            getting a busy signal" [syn: busy, engaged, {in
            use(p)}]
     2: currently being used; "robots are in use throughout
        industry"