churn up

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churn up

To cause the movement of something in a liquid (such as sediment of some kind) by stirring. A noun or pronoun can be used between "churn" and "up." I stirred the milk and churned up bits of chocolate powder that had settled to the bottom of the glass. Because we're so close to the shore, your oars will likely churn some pebbles up.
See also: churn, up

churn something up

to stir up a liquid; to mix up material suspended in water. The oars of our boat churned the shallow water up, leaving little clouds of sediment in our wake. The oars churned up the mud.
See also: churn, up