Simple past tense and past participle of lunch. (verb)
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Use "lunched" in a sentence
"And let us suppose that this scientist, finding it to be four o'clock in the afternoon, and that he has not yet lunched, is conscious, with a feeling of pleasure, of the fact that he has been at work in his laboratory instead of in his own home, where they would have called him hours ago, interrupting his interesting observation, in order that he might eat."
"The Prussian sent word that he would admit the two men to his presence after he had lunched, that is to say, about one o'clock."
"That day he had "lunched" an Arctic explorer, a short-story writer, and the famous conductor of a slaughter-house expose."