mixmixmixesmixedmixingverb (mixes, mixing, mixed)1to put different things together to make something new: Mix yellow and blue paint together to make green.2to join together to make something new: Oil and water don't mix.3to be with and talk to other people: In my job, I mix with a lot of different people.mix somebody or something upto think that one person or thing is a different person or thing: People often mix Mark up with his brother.mix something upto make things untidy: Don't mix up my papers!