The antonyms for the phrase "are the trail of," which means to leave behind evidence or clues, could be "disappear without a trace," "cover up," or "erase all evidence." When someone "covers up" their tracks, they intentionally hide or conceal evidence that would otherwise give away their actions. Conversely, "disappearing without a trace" implies that someone has left no evidence behind unintentionally, making it impossible to trace their movements. Lastly, "erasing all evidence" suggests that someone has gone to great lengths to delete any record of their actions, leaving no trail for anyone to follow. These antonyms provide a contrast to the original phrase, highlighting the various ways people can avoid leaving a trail behind.