Slide back is a term that can be used to describe a RELAPSE, which is defined as a return to an earlier condition or activity. It is often used in the context of addiction, where a person may have been abstaining from a substance or behavior, but then returns to it. It can also be used to describe a return to a previous state of health or mental well-being. In general, slide back is a term used to describe a return to a prior state or condition.