be in/out of use

be in use

To be currently occupied or utilized. The shower is in use so you'll have wait for now.
See also: use

be out of use

To be unable to be used at the moment, as of something that needs to be fixed. The elevator is out of use right now, so you'll have to take the stairs.
See also: of, out, use

be in/out of ˈuse

be/not be being used: We’ll have to find a classroom that’s not in use.The road’s out of use while it’s being repaired.
See also: of, out, use