There are many synonyms for the phrase "gets one hair" depending on the context in which it is used. In a literal sense, it could mean the act of removing a single hair from the body. Some synonyms for this include pluck, pull, tweeze, or depilate. In a figurative sense, it could mean becoming irritated or annoyed. In this sense, synonyms might include agitated, provoked, irked, or displeased. Another interpretation could be grasping or understanding a concept, in which case some synonyms could be comprehend, fathom, or grasp. It is important to consider the context in order to choose the appropriate synonym for the task at hand.