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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English sour dogh, equivalent to sour + dough, compare German Sauerteig and Dutch zuurdeeg. The senses pertaining to California, Alaska and the Yukon derive from the distinctive pouches of bread starter (starter dough used to make sourdough) worn on a belt or around the neck by experienced prospectors during the Klondike Gold Rush and California Gold Rush.
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Classic usage
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