mock turtleneckn. originally and chiefly North American a high, close-fitting neck on a garment, designed to resemble a turtleneck; a garment having such a neck.
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1953 Sears Catal. Spring–Summer 241/2 Stripes..point up a mock turtleneck separate that you'll love.
1996 New Idea (Austral.) June 51/3Mock turtleneck, $19.95, and overshirt, $39.95.