Third-person singular simple present indicative form of ruin.(verb)
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Use "ruins" in a sentence
"It has been a difficult trek for The President, he was handed a Nation in ruins from the last administration."
"I have a strong memory of the cathedral that was still in ruins from the war."
"The fate of Charleston, now desolate and in ruins, is but another historical illustration, added to many foregoing ones, that reason, law, and justice cannot be set at defiance, by however strong a will, with ultimate impunity."