1. To combine into something else. Make sure to keep stirring the egg whites vigorously and steadily so that the sugar mixes into it evenly. I love barbecuing in the summer, as the smell of sizzling hamburgers and sausages mixes into the ambient aromas of the lush, sunsoaked grass and trees.

2. To stir, combine, or mingle something into something else. In this usage, a noun or pronoun is used between "mix" and "into." This turbine mixes a powerful cleaning agent into the contaminated water to kill any bacteria present. Mix the salt into the solution very slowly and steadily, or else it won't dissolve into the solution properly.

3. To mingle, fit in, or socialize well with some group of people. I've always had a hard time mixing into groups of people I don't know. I was worried that Tommy wouldn't mix into his new school very well, but he's been doing very well there.

4. To join or mingle two or more people in a social situation. In this usage, a noun or pronoun is used between "mix" and "into." It was a little awkward at first mixing my new girlfriend into my group of friends, but they all get along very well now. I try to mix the interns into different departments across the company throughout their time with us so that they learn as much as possible in their time here.