"Touch a sore spot" means to bring up a sensitive topic that causes discomfort or emotional pain. There are several synonyms that can be used instead of this phrase. For instance, one can say "hit a nerve", "rub someone the wrong way", or "strike a raw nerve". All of these phrases convey the same meaning as "touch a sore spot" and are commonly used in the English language. These expressions are useful when discussing sensitive topics that may cause discomfort or emotional pain to individuals. Therefore, it is essential to choose the right synonym that fits the context of the discussion to avoid misunderstandings or hurt feelings.