Making mistakes is a natural part of life, but sometimes we may struggle to find the right words to describe our errors. Luckily, there are many synonyms for the phrase "make a mistake". Some alternatives include "error", "blunder", "fault", "inaccuracy", "misstep", "slip up", "gaffe", "oversight", "mistake", "miscalculation", "misjudgment", and "flub". Each of these words has a slightly different connotation, so choose the one that best fits the situation. Using synonyms can help to add variety and interest to your writing or conversation, while still conveying the same basic meaning.