Sack drill is US military slang for sleep — with 'sack' being military slang for bed or bunk, and 'drill' used ironically to describe the 'practice' of lying in it. The term is humorous and self-aware, poking fun at military culture's tendency to frame everything as training or practice. It is used informally among soldiers and veterans and captures the gallows-humour register common in military speech. Also seen as 'hitting the sack drill' or simply 'drilling on the sack'.
After a forty-mile ruck march, the only drill anyone wanted was sack drill.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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(US, military slang, idiomatic) Sleep.
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