马甲 mǎjiǎ vest Origin Definitions Defs Strokes Stroke Words Sentences Sents 红马甲 hóngmǎjiǎ red waistcoat a red waistcoat or vest马甲线 mǎjiǎxiàn abdominal lines A vertical groove visible on either side of the belly in a person with well-toned abdominal muscles.