Definitions for knockout drops
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Random House Webster's College Dictionary
knock′out drops`(n.pl.)
a drug, esp. chloral hydrate, put in a drink secretly to make the drinker unconscious.
Origin of knockout drops:
1890–95
Princeton's WordNet
knockout drops(noun)
chloral hydrate in combination with alcohol; usually administered surreptitiously to make the drinker unconscious
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"knockout drops." Definitions.net. STANDS4 LLC, 2013. Web. 26 May 2013. <http://www.definitions.net/definition/knockout drops>.