The phrase "cuts corners" refers to taking shortcuts, usually with the intention of saving time or effort. An antonym for this phrase would be "follows the rules", meaning that someone is committed to strictly adhering to established guidelines and regulations. Alternatively, "takes the long way" could also be an antonym, indicating that someone is willing to go the extra mile and take the necessary time to complete a task fully and thoroughly, without cutting any corners. Other possible antonyms could include "takes the conventional route", "does the job right", or "plays by the book". All of these alternatives emphasize the importance of staying true to established protocols and standards, rather than taking shortcuts or cutting corners.