mix up

1 of 2

verb

mixed up; mixing up; mixes up

transitive verb

1

: to mistakenly think that (someone or something) is someone or something else : confuse

mixed the twins up

mixed up the times for the meetings

2

: to mistakenly put (something) in a place where something else should be

mixed up the two files

3

: to cause (someone) to be involved in a usually dangerous or improper activity

—usually used as (be/get) mixed up in

got mixed up in an illegal scheme

4

: to cause (someone) to become involved with usually bad or dangerous people

mix-up

2 of 2

noun

ˈmiks-ˌəp 

1

: a state or instance of confusion

a mix-up in our hotel reservations

2

: mixture

3

: conflict, fight

Synonyms of mix up

Noun

• mistake
• confusion
• foul-up

Examples of mix up in a Sentence

Noun

there was a mix-up at the airport and our luggage was accidentally sent to Ohio

Recent Examples on the Web

Verb

Design your dream slime by mixing up your choice between eight textures, 60 scents, 40 colors, and 120 charms. —Liz Regalia, Parents, 3 Mar. 2026

Why your airfare might not be refunded Many travelers mix up airfare refunds, care (hotels and meals), and compensation. —Scott Campbell, Condé Nast Traveler, 3 Mar. 2026

Noun

The fateful mix-up happened about a mile from the finish line in downtown Atlanta. —Bill Chappell, NPR, 5 Mar. 2026

Even the extra two hours the judge granted may not be enough to account for long lines and delays caused by the mix-up, Jenkins said. —Bayliss Wagner, Austin American Statesman, 3 Mar. 2026

Word History

First Known Use

Noun

1841, in the meaning defined at sense 1

Kids Definition

mix-up

noun

ˈmik-ˌsəp

: an instance of confusion