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to mix; to stir; to blend
砂糖さとうと塩しおを混ぜまぜないでください。
Please do not mix sugar and salt.
卵たまごと牛乳ぎゅうにゅうをよく混ぜまぜた方ほうがいい。
You should mix the eggs and milk well.
砂糖さとうと小麦こむぎ粉こなを先さきに混ぜまぜておくと楽らくだ。
It's easier if you mix the sugar and flour first.