Slide open is a phrase used to describe the act of opening a door or window by sliding it horizontally. However, there are many other synonyms that can be used to describe this action. Some of these synonyms include glide open, slip open, move aside, shift open, and slide away. Each of these phrases can be used interchangeably with slide open to create variety in descriptions and avoid repetition. Whether in written or spoken language, it is helpful to have a variety of synonyms at your disposal to make your communication more interesting and engaging.