The term 'keep back' can be defined as restraining, denying, muffling, curbing, deterring, flunking, detaining, quelching, subduing, forbearing, holdout, repressing, or squelching. Restraining is the act of limiting or controlling someone or something, while denying is the act of refusing to accept or acknowledge something. Muffling is the act of reducing the sound of something, while curbing is the act of restraining or controlling something. Deterring is the act of discouraging someone from doing something, while flunking is the act of failing a test or course. Detaining is the act of keeping someone in custody, while quelching is the act of suppressing or extinguishing something. Subduing is the act of bringing someone or something under control, while forbearing is the act of refraining from doing something. Holdout is the act of refusing to accept something, while repressing is the act of keeping something down or in check. Finally, squelching is the act of suppressing or silencing something. All of these words can be used to describe the term 'keep back'.