Antonyms for the phrase "meets up with" include "part ways," "misses," "ignores," "separates," and "avoids." When someone meets up with another person, it suggests an intentional and positive encounter or gathering. However, if one chooses to part ways, they are intentionally separating from the other person. If one misses, they were unable to connect with the other person. Ignoring the other person and avoiding them, on the other hand, is intentional disconnection. These antonyms demonstrate the different shades of meaning that can arise from the opposite of "meets up with" and the nuances at play in communication.