To parenthesize means to enclose a word or phrase in parentheses or to put emphasis on a specific detail or concept. Some synonyms for parenthesize include bracket, isolate, highlight, underscore, accentuate, emphasize, and stress. These words can be used to convey a similar meaning to parenthesize, but with a slightly different tone or purpose. For example, using the word bracket emphasizes the separation of the enclosed text from its surroundings, while emphasizing or stressing is used to bring greater significance to the enclosed idea or detail. Overall, these synonyms offer a range of options for expressing the act of enclosing or emphasizing information in a written or spoken context.