a unit of weight, used esp in E Asia, traditionally equal to about one and a half pounds but formalized as 0.5 kg in mainland China, 0.6 kg in Taiwan and Thailand, and about 0.605 kg in Hong Kong, Malaysia, and Singapore(Mandarin) Chinese name:: jin
1886, “devious and spiteful,” from cat (n.) + -y (2). Slightly earlier was cattish. Meaning “pertaining to cats” is from 1902. Related: Cattily; cattiness.