The phrase "in juxtaposition" means to place things side by side, either for contrast, comparison, or visual effect. There are many synonyms for this phrase, which can be used interchangeably in different contexts. Some of these synonyms include "beside each other," "next to one another," "adjacent to," "parallel to," "side by side," "in close proximity," "abutting," "sharing a border," "contiguous," and "in contact with." These synonyms can be useful when trying to emphasize the relationship between two or more objects or ideas, highlighting their similarities or differences by putting them in close physical or conceptual proximity.