Simple past tense and past participle of opaque.(verb)
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Use "opaqued" in a sentence
"But even that was a problem because every page of black plate film had all the word balloons opaqued out — a common thing to happen when a book is printed in a foreign country where the English words are covered up and replaced with the host language."
"But, an opaqued over window could be just as depressing as looking at a neighbor with questionable taste."
"Blood dripped from Charlie's nose and opaqued his faceplate."