'mix-up' definitions:

Definition of 'mix-up'

From: WordNet
noun
A mistake that results from taking one thing to be another; "he changed his name in order to avoid confusion with the notorious outlaw" [syn: confusion, mix-up]

Definition of 'mix-up'

From: GCIDE
  • mix-up \mix-up\ n. a mistake that results from taking one thing to be another.
  • Syn: confusion, confounding. [WordNet 1.5]