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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
PIE word *dwóh₁ From French duo or Italian duo, from Latin duo (“two”), from Proto-Italic *duō, from Proto-Indo-European *dwóh₁. Doublet of two, which was inherited via Proto-Germanic.
couple, pair, twosome, twain, brace, span, yoke, couplet, distich, duet, dyad, duad
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Classic usage
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