Past tense of plough: to turn over soil with a plow for farming, or to push forcefully through something.
From Old Norse 'plógr' (plough), replacing Old English 'sulh.' The word entered Middle English through Scandinavian influence and has multiple spellings (plough/plow), with British English preferring 'plough.'
The Great Plough (Big Dipper) is named after the farming tool because the star pattern looked like a plow to ancient farmers—showing how agricultural tools were so fundamental to life that people saw them in the sky!
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