Etymology
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mix-up (n.)

"state of confusion," 1841, from the colloquial verbal phrase mix up "to confuse, entangle mentally" (1806), from mix (v.) + up (adv.). Of fighters, to mix it up "exchange blows" is by 1898.

updated on February 05, 2019

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Definitions of mix-up from WordNet

mix-up (n.)
a mistake that results from taking one thing to be another;
Synonyms: confusion
From wordnet.princeton.edu, not affiliated with etymonline.