TURTLENECK

UK, US mock turtleneck [noun] [C] - a piece of clothing for the upper part of the body, or the tight part at the neck of such a top which does not fold over itselfI bought a new turtleneck.The sweater has a turtleneck.a turtleneck sweaterSee picture: Collars and tiesTurtleneck is also US for polo neck.See at polo.