Simple past tense and past participle of widen.(verb)
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Use "widened" in a sentence
"Gross margin widened to 45.2% from 40.5% amid lower production costs."
"The average accepted spread on bonds with a maturity of one year or less widened from the previous operation, suggesting that investors are willing to sell at below-market prices."
"Operating margin widened to 15.3% from 11.9% as operating expenses decreased 3.8%."