knuckleduster
英 [ˈnʌkldʌstə(r)]
美 [ˈnʌkldʌstər]
n. 指节金属套(用作武器)
BNC.47513
牛津词典
noun
- 指节金属套（用作武器）
a metal cover that is put on the fingers and used as a weapon
柯林斯词典
- 指节金属套（用作武器）
A knuckle-duster is a piece of metal that is designed to be worn on the back of a person's hand as a weapon, so that if they hit someone they will hurt them badly.
in AM, use 美国英语用 brass knuckles