The phrase "set beside" refers to the act of placing something or someone next to another object or individual. There are several synonyms that can be used in place of this phrase, including "place alongside," "position adjacent to," "align with," and "place side by side." Other options include "lay next to," "set parallel to," and "position next to." These phrases are useful in a wide range of contexts, from describing the arrangement of furniture in a room to explaining the placement of objects in a scientific experiment. Using a variety of synonyms can help to add variety and emphasis to your writing.