Definition of mix up phrasal verb from the Oxford Advanced American Dictionary

 

mix up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

mix somethingup

 
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to change the order or arrangement of a group of things, especially by mistake or in a way that you do not want Someone has mixed up all the application forms. related noun mix-up

mix somebody/something up (with somebody/something)

 
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to think wrongly that someone or something is someone or something else synonym confuse I think you must be mixing me up with someone else. see also mixed-up
See the Oxford Advanced Learner's Dictionary entry: mix up