Touching a sore spot refers to bringing up a sensitive or embarrassing topic that may cause discomfort or unease in a person. Synonyms for this phrase include hitting a nerve, striking a sensitive chord, pushing a button, treading on thin ice, or opening a can of worms. Each of these phrases conveys the idea of unintentionally or deliberately raising a delicate issue that may have emotional or psychological implications. It is essential to be mindful of the impact such remarks may have on a person and to be respectful of their feelings. When in doubt, it is best to avoid topics that could touch a sore spot to prevent any hurt or misunderstanding.