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knockout drops

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WordReference Random House Unabridged Dictionary of American English © 2026

knock′out drops′,

chloral hydrate or any similar rapidly acting drug, esp. one put in a drink secretly to make the drinker unconscious.

1890–95

Collins Concise English Dictionary © HarperCollins Publishers::

knockout drops

a drug secretly put into someone's drink to cause stupefaction
See also Mickey Finn

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