1. phrasal verb If something stirs up dust or stirs up mud in water, it causes it to rise up and move around. [V n P] ⇒ They saw first a cloud of dust and then the car that was stirring it up. [Also V P n (not pron)] 2. phrasal verb → stir If you stir up a particular mood or situation, usually a bad one, you cause it. [disapproval] [V P n] ⇒ As usual, Harriet is trying to stir up trouble. [V P n (not pron)] ⇒ He said senior government officials were trying to stir up ethnic tension. [V n P] ⇒ I thought at first that Jay had been stirring things up.
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