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The word is not "SWELLING" is it "rising" or "proving". It refers to the growth on volume of the worked (kneaded) dough due to the "leavening" action of microorganisms (usually yeasts) that have been incorporated into the dough. These metabolize sugars in the dough and give off Carbon Dioxide gas, bubbles of which, trapped in the dough, cause its volume to increase.

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10y ago

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