The term "curled one's lip" refers to a facial expression that signals disgust, contempt, or disdain. Antonyms for this expression include phrases that indicate friendliness, happiness, or approval. The opposite of curling one's lip would be to smile warmly, to have an open and friendly expression, or to show appreciation or admiration. Other antonyms could include phrases like "show kindness" or "be affectionate." Overall, antonyms for "curled one's lip" serve to signal positive emotions and attitudes, whereas the original phrase indicates a negative or judgmental outlook.