The phrase "got in one hair" typically means to make a tiny mistake or to take a misstep. If you're looking for synonyms for this expression, you might try "missed by a hair," "went slightly awry," or "made a small blunder." Other options could include "fumbled," "slipped up," or "made a minor error." All of these phrases suggest that a mistake has been made, but they also imply that the error is relatively minor and can likely be corrected or mitigated with minimal effort. So if you're trying to describe a small mistake without overstating its significance, any of these synonyms could be a good choice.