mix up
VerbOpen English WordNet
Verb (2)
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perennialadjective
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Webster's Dictionary (1913)
mix up noun
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. 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.
Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54 · with additions: GCIDE editors