1something in the shape of a spiral or coil, especially a lock of hair:her blonde hair was a mass of tangled curlsa curl of blue smoke
a curling movement:the sneering curl of his lip
(with reference to a person’s hair) a state or condition of being curled:your hair has a natural curl [mass noun]:large perm rods give volume and control rather than lots of curl
2a weightlifting exercise involving movement of only the hands, wrists, and forearms:a dumb-bell curl
3 Mathematics a function giving a measure of the rotation of a vector field.
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Universal
1form or cause to form into a curved or spiral shape: [no object]:her fingers curled round the microphonea slice of ham had begun to curl up at the edges [with object]:she used to curl her hair with rags
[no object] (curl up) sit or lie with the knees drawn up:she curled up and went to sleep
move or cause to move in a spiral or curved course: [no object, with adverbial of direction]:a wisp of smoke curling across the sky
(with reference to one’s mouth or upper lip) raise or cause to raise slightly on one side as an expression of contempt or disapproval: [no object]:Maria saw his lip curl sardonically
2(in weight training) lift (a weight) using only the hands, wrists, and forearms:slowly curl the barbell to shoulder height
3 [no object] play at the game of curling:during the severe spell in 1740, men curled on the pond
make someone's hair curl
informal shock or horrify someone:she drives at a speed to make your hair curl