A2[I or T]to (cause different substances to) combine, so that the result cannot easily be separated into its parts: Oil and water don't mix. Even if you shake them together they separate into two layers.Radioactive material was mixed in/up (with) the effluent.Mix the eggs into the flour.In a large bowl, mix together the sugar and raisins.[+ two objects]Shall I mix (= make) you a cocktail?Mixing and mixturesVariety and mixturesConnecting and combiningGroups and collections of thingsB1[T]to have or do two or more things, such as activities or qualities, at the same time: Some people are happy to mix business with/and pleasure, but I'm not one of them.Mixing and mixturesVariety and mixturesConnecting and combiningGroups and collections of things