Rollneck vs. Turtleneck — What's the Difference?

A turtleneck sweater.

A high, tubular, often rolled-down collar that fits closely about the neck.

A garment, such as a sweater, that has this type of collar.

(North America) A high, close-fitting collar, turned back on itself and covering all or most of the neck, on a sweater or similar garment.

(North America) turtleneck sweater

(slang) A foreskin.

A sweater or jersey with a high close-fitting collar

Having a high tubular collar fitting closely around the neck