knockout drops
noun [ plural ] old-fashioned informal uk/ˈnɒk.aʊt ˌdrɒps/ us/ˈnɑːk.aʊt ˌdrɑːps/
（常指偷偷掺入饮料中的）强麻醉药，蒙汗药
a drug, usually put secretly into your drink, that makes you sleep
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