D defs.my
Entry 1 sense Webster, 1913

knockout drops

· IPA
01 n. pl. Drops of any drug, used to a person to fall asleep or become unconscious or stupefied for the purpose of robbery, etc.; they are usually mi…
  1. 1.
    Drops of any drug, used to a person to fall asleep or become unconscious or stupefied for the purpose of robbery, etc.; they are usually mixed into a drink so that the person consuming it does so unknowingly. One compound used for this purpose is chloral hydrate.[Slang, U. S.] See: chloral hydrate