Etymology
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dragnet (n.)

also drag-net, "a net to draw along the bottom of a body of water for taking fish," 1540s, from see drag (v.) + net (n.). Figurative use is from 1640s; police sense attested by 1894. Probably not directly from Old English drægnet, which became early Middle English draynet and then vanished.

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Definitions of dragnet

dragnet (n.)
a system of coordinated measures for apprehending (criminals or other individuals);
caught in the police dragnet
dragnet (n.)
a conical fishnet dragged through the water at great depths;
Synonyms: trawl / trawl net
From wordnet.princeton.edu