Simple past tense and past participle of sheen.(verb)
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Use "sheened" in a sentence
"I bolted upright, gasping, heart slamming in my chest, body sheened with sweat."
"The upper end of the tank, full width, was a broad spillway, sheened with an inch of smooth-slipping water."
"Their jewels and cloth of gold, the deeply rich velvets and finely sheened silks that adorn them, are all eclipsed by their own insurmountable beauty."