Stir (verb) means the action of using a tool to rotate liquid in a container.
"Place the ingredients in the bowl and stir them thoroughly."
"Please do not stir my Martini."
"I usually put one spoon of sugar in my tea, after which I stir it."
Mingle (verb) is something that a person does to meet lots of people at an event such as a party. It implies movement around a room or venue and is a deliberate action.
"Darling, please stop talking to your mother and mingle with our guests."
"The conference last year was a good opportunity to mingle with like-minded people."
Intermingle (verb) means to place objects of different types together such that lots of objects of one type are next to objects of a different type. These can be objects or people.
"I like to intermingle jokes with the more serious elements of my speeches."
"The Bangladeshi community in my home town is intermingled with people from lots of different backgrounds."
Mix (verb) is similar to intermingle, that is objects are placed together such that they are not separated by type. The difference between them is that intermingle implies the individual objects are still seen and recognisable afterwards. When you mix something, it generally forms a whole new thing from the components.
"This spice is actually a mix of several different spices."
"Can you please mix these ingredients in the bowl?"
Mix can also be used as a noun.
"The mix of music in the club was really interesting."
Blend (verb) means to take several things, chop them finely and put them together to form a new thing.
"This milkshake is made by blending banana, milk, cream and sugar."
"I blend blue and yellow paints to make green."
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