The story
From gang (“a combination of tools or machines coordinated to work together as a set”) + plow (“a farm implement used to break up soil into furrows for sowing”).
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A plow with multiple plowshares, moldboards, and colters, arranged in a series to turn parallel furrows simultaneously. Full definition →
From gang (“a combination of tools or machines coordinated to work together as a set”) + plow (“a farm implement used to break up soil into furrows for sowing”).
Etymology from Wiktionary, CC BY-SA 4.0.