The word "un-curl" means to straighten or flatten something that is curled or coiled. Some antonyms for this word include curl, coil, twist, twirl, and wind. These words describe actions that create a curved or spiraled shape in an object or material. For example, you might curl your hair using a curling iron, coil a rope for storage, twist a piece of wire to form a hook, twirl a baton in a marching band, or wind a spring to store energy. By understanding these antonyms for "un-curl," you can expand your vocabulary and communicate more effectively in a variety of contexts.