English

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Etymology

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un- +‎ dream

Verb

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undream (third-person singular simple present undreams, present participle undreaming, simple past and past participle undreamed or undreamt)

  1. (transitive) To dismiss from the imagination as though never dreamed.
    • 1876, Fanny Wheeler Hart, Miss Hitchcock's Wedding Dress:
      Dreams, whether waking or sleeping ones, continue part of us. We can't undream them. We are roused out of them, but they remain.
    • 1880, Theodore Dwight Weld, In Memory: Angelina Grimké Weld:
      This is all like a dream now; but I can't undream it, and I can't resist it. I must go.

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