knockout drops

knockout-drops的词性：
pl.n.Slang （复数名词）【俚语】

1. A solution, usually of chloral hydrate in alcohol, put into a drink surreptitiously in order to render the drinker unconscious.
强麻醉药，蒙汗药：私下放到饮料中使饮用者失去知觉的一种溶液，通常是酒精中的水合氯醛