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Use "gusseted" in a sentence
"Eight by ten is a good size: triple-stitched, water-proof, heavily gusseted at the corners."
"Everything about the Rolls feels gusseted, wrapped in velvet, strung with silk, double-isolated with hydro-elastic this-and-that and suspended on bushings made of fetal pigskin."
"We appreciate your feedback and are indeed reviewing our packaging verbiage addressing the dimensions of our gusseted pillows."