The phrase "crossing t's" means paying close attention to details and making sure everything is correct. However, the antonyms for this phrase would be neglecting or ignoring details, being careless or sloppy, or failing to follow instructions carefully. Sometimes, people may rush through tasks without verifying their accuracy, resulting in mistakes and errors. This behavior can be detrimental in professional or academic settings, where precision and attention to detail are highly valued. Therefore, it is essential to cultivate a habit of thoroughness and diligence to ensure that every i is dotted and every t is crossed.