The phrase "touch a chord" means to evoke a strong emotional response in someone. There are several synonyms for this phrase, including strike a chord, hit a nerve, resonate, and stir up emotions. Each of these phrases captures the idea of making a deep and lasting impression on someone's heart or mind. Other possible synonyms for "touch a chord" might include tug at the heartstrings, pull at the emotions, or strike an emotional chord. Whatever words you choose to use, the idea is always the same - to create an emotional connection with someone that leaves a lasting impression.