The antonyms for the phrase "correct midcourse" would be "incorrect deviation" or "wrong turn". When a midcourse correction is necessary, it means that some action is needed to steer back on the right track. However, an incorrect deviation means that the opposite is happening, and the course is going off target. Similarly, a wrong turn could mean that the direction chosen leads away from the intended destination. These antonyms serve as reminders of what not to do when attempting to navigate a desired path. Ultimately, staying aware of potential deviations and choosing the correct course of action will lead to successful outcomes.