"Change one's tune" refers to changing one's opinion or attitude towards a person or a situation. Synonyms for "change one's tune" include "turn around," "about-face," "flip-flop," "shift gears," "switch sides," "alter one's stance," "embrace a different view," "reverse course," and "make a U-turn." These phrases indicate a change of direction or a change of heart concerning a particular matter. People may change their tune due to new information, a change in circumstances, or a change of mind. Regardless of the reason, changing one's tune can bring about positive results and lead to a better understanding of the situation at hand.