in use

adjectives

(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"

busy, engaged, in use

currently being used

"robots are in use throughout industry"

in use

is similar to

employed in accomplishing something

"the principle of surprise is the most used and misused of all the principles of war"- H.H.Arnold & I.C.Eaker

used