In the workplace, OOS often means "out of service." This is not something that can be combated. It is a notice that a piece of equipment is unable to be used. When you see suc…h a notice, you should not even try to operate the equipment. It must be repaired and checked out before it can be safely used. The initialism OOS can also have other meanings in other contexts. These include: .
out of style .
out of synch .
occupational overuse syndrome .
online order system .
our own standards and many others. (MORE)