A high, close-fitting collar, turned back on itself and covering all or most of the neck, on a sweater or similar garment
{i} high close-fitting collar that can be turned down; sweater with a turtleneck collar
A turtleneck or turtleneck sweater is a sweater with a high neck which folds over. a type of sweater with a high, close-fitting collar that covers most of your neck polo neck, v-neck v-neck
A turtleneck or turtleneck sweater is a sweater with a short round collar that fits closely around your neck