Simple past tense and past participle of interline.(verb)
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Use "interlined" in a sentence
"Methinks, young women, I have made a great progress in four days, at the bottom of this side already, and no letter yet come from MD (that word interlined is morning)."
"On the first sheet, Brown has interlined, upside down, the third page of his letter."
"The rest of the letter is interlined, as Brown says, "upside down.""