mix up (2)
Meaning: If you mix things up, you put things of different kinds together when they are usually separated.
- mix sth up Keep your photos separate from mine. Don't mix them up.
- mix sth up with sth David's underpants are now pink because he mixed his whites up with his coloureds when he was washing his clothes.
We try to keep our beginner students and our advanced students in separate classes, but we have to mix them up when