What is Coil ?
Coil is (noun) 1. a roll of rope, or one loop in something twisted round and round The sailors stacked the rope in coils on the deck. They surrounded the camp with coils of barbed wire. 2. a device fitted into a woman’s uterus as a contraceptive(verb) to twist around something or into a coil The snake had coiled itself up in the basket. The sailor coiled the ropes neatly. Synonym wind
source: Easier English, Student Dictionary Upper Intermediate Level