tur·tle·neck 
/ˈtɚtl̟ˌnɛk/ noun
plural tur·tle·necks /ˈtɚtl̟ˌnɛk/ noun [count] 1 US : a high collar that covers most of your neck even when the collar is folded over itself ; also : a knit shirt or sweater with this kind of collar
▪ She wore a turtleneck under her jacket. —called also (Brit) polo neck; — see color picture 2 Brit : mock turtleneck
▪ She wore a turtleneck under her jacket. —called also (Brit) polo neck; — see color picture
