The phrase "coming heel" can be interpreted in a few different ways, leading to a variety of synonyms. For example, if referring to someone who is falling behind in a race, synonyms could include "lagging," "trailing," or "straggling." If used to describe an upcoming change in circumstances, alternatives might include "impending," "approaching," or "forthcoming." If discussing someone who is approaching or catching up to a group, synonyms could include "joining," "meeting," or "rejoining." The specific synonym used will depend on the context in which "coming heel" is being used and the overall tone of the discussion.