ill-use
— Verb
– English
～ treat badly; "This boss abuses his workers"; "She is always stepping on others to get ahead"
in use
— Adjective
– English
～ (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"
in use
— Adjective
– English
～ currently being used; "robots are in use throughout industry"