knockout drop
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
A drop of a drug used to make a person fall asleep or become unconscious or stupefied for the purpose of robbery, etc., typically by mixing it into a drink.
Register: slang
Where it’s used:
Used
American English
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “knockout drop” mean?
A drop of a drug used to make a person fall asleep or become unconscious or stupefied for the purpose of robbery, etc., typically by mixing it into a drink.
Is “knockout drop” formal or informal?
knockout drop is generally slang.