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Entry 2 senses Webster, 1913

mix up

· IPA
01 n. To confuse the identities of (two or more objects); to mistake (one object for another); as, at the family gathering he mixed up his two ni…
  1. 1.
    To confuse the identities of (two or more objects); to mistake (one object for another); as, at the family gathering he mixed up his two nieces, to their great amusement.
  2. 2.
    To mix together; -- usually implying a mistake, whether done intentionally or unintentionally; as, the mixed up this year's receipts with last year's, and it took hours to find the right ones.