Marking out is a common phrase that refers to drawing lines or other types of visual indicators to demarcate boundaries or indicate areas for further action. Antonyms for this phrase could include phrases such as erasing, wiping out, clearing, or removing lines. These phrases imply that the previous markings were not effective or relevant, and now require a new approach or strategy to define the boundaries or areas of focus. Other antonyms could include phrases such as ignoring or overlooking markings, which suggest that the lines or indicators are not important or do not require attention. Ultimately, the choice of antonyms for marking out depends on the context and purpose of the markings being used.