The antonyms for the word "double checks" can be single check, verify once, or trust. These words convey a sense of certainty, where one check or verification is enough to ensure the accuracy of the information or task at hand. However, in some cases, relying on single checks or trust can lead to errors or mistakes, especially if the information is complex or critical. Double checks are often necessary in situations that require absolute precision, such as medical procedures or financial transactions. Therefore, while single checks may save time and effort, double checks are essential for maintaining quality and avoiding costly errors.