Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Waterboarding" Definition
noun
A type of torture technique in which the victim is immobilized, has towels or rags wrapped over their face, and has water poured onto them, which simulates the sensation of drowning.
Source: Wiktionary
An interrogation technique in which is forced into a detainee's mouth and nose so as to induce the sensation of drowning.
Source: Merriam-Webster
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