What is Curl ?
Curl is (noun) 1. a lock of hair which twists The little girl looked so sweet with her golden curls. 2. a twist in the hair My hair has a natural curl.(verb) 1. to make hair twist round She curled her hair round her finger. She went to the hairdresser’s to have her hair curled. 2. to twist my hair curls naturally Some creepers curl round other plants. 3. to curl up to bend your body into a round shape She curled up on the sofa and went to sleep.
source: Easier English, Student Dictionary Upper Intermediate Level