knockout drops

noun
1.
chloral hydrate or any similar rapidly acting drug, especially one put in a drink secretly to make the drinker unconscious.
Origin
1890-95
British Dictionary definitions for knockout drops

knockout drops

plural noun
1.
(slang) a drug secretly put into someone's drink to cause stupefaction See also Mickey Finn
Slang definitions & phrases for knockout drops

knockout drops

noun phrase

Chloral hydrate or another stupefacient drug, esp when put into a drink of liquor; mickey finn (1876+)