Other forms: turtlenecks
A turtleneck is a jumper whose high collar folds over and hugs the neck. A black turtleneck, wear a turtleneck, a turtleneck jumper.
The British word is polo neck for the folded-over kind, with turtleneck used in Britain for the shorter unfolded collar — so the same garment has different names on each side of the Atlantic and a second meaning within Britain. The black turtleneck became a uniform of designers and film directors, which is a joke everybody now shares.
1nounturtleneckA jumper whose high collar folds over and hugs the neck.
“He wore a black turtleneck under his jacket to keep his neck warm.”
turtleneck is a garment.
Also accepted in games: polo neck
Turtle plus neck, from the resemblance to a tortoise's neck emerging from its shell. The British polo neck is named from the sport's jerseys instead.
From turtle + neck.
Etymology from Wiktionary, CC BY-SA