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Comes from the military/navy, specifically submarine jargon. Refers to the order for seamen "lookout(s)" that are "topside" to descend into the sub from their lookout stations in preparation of the sub submerging..."Lookouts below! Dive! Dive! Dive!"

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∙ 14y ago
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F. Rapaport

Lvl 1
∙ 3y ago
Also comes from middle ages, when citizens dumping their urine and excrement pots from 2nd and third stories into streets were legally required to call-out "look out below!"

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