Definition from Wiktionary, the free dictionary
crewneck (plural crewnecks)
- A round neckline with a ribbed texture.
2009 March 15, Geoffrey Wolff, “Suburban Suffering”, New York Times:
- For a writer celebrated for his control of his characters’ inner lives, for a husband and father notoriously prickly about his expression of the suburban proprieties — the crewneck Shetland sweater and khakis, the plummy faux-Brahmin accent, the adoring Labrador at his feet, the woodpile neatly stacked and grass hand-scythed — here was scandal in full spate, sludge flooding over his family and friends.
- (by extension) A shirt, sweater, or similar garment with such a neckline.