A turndown collar that has a soft fold (rather than a pressed crease).
Of a garment: that has a roll collar.
Mid 19th century; earliest use found in The Morning Chronicle. From roll + collar.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。