1. mix up - Noun
2. mix up - Verb
assemble without order or sense
a mistake that results from taking one thing to be another
cause to be perplexed or confounded
Source: WordNetmix-up
She jumbles the words when she is supposed to write a sentence Source: Internet
he changed his name in order to avoid confusion with the notorious outlaw Source: Internet
This problem stumped her Source: Internet
Adults who are working from home should also attempt to mix up their schedules during the day. Source: Internet
As part of the same plant family, varieties are often mistaken for each other, but they require similar care so a mix-up will not have dire results. Source: Internet
Due to an administrative mix-up, Cummings was not assigned to an ambulance unit for five weeks, during which time he stayed in Paris. Source: Internet