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churn1

1 [intransitive] if your stomach churns, you feel sick because you are nervous or frightened :
My stomach was churning on the day of the exam.
My stomach was churning on the day of the exam.2 [intransitive and transitive] also churn up if water, mud etc churns, or if something churns it, it moves about violently :
We watched the ocean churn.
We watched the ocean churn.3 [intransitive] if a machine, engine, wheel etc churns, it or its parts begin to move :
I pressed the gas pedal, and slowly the wheels began to churn.
I pressed the gas pedal, and slowly the wheels began to churn.4 [transitive]TA to make milk by using a churn
churn something ↔ out
phrasal verb
She's been churning out novels for twenty years.churn somebody/something up
phrasal verb1 to damage the surface of the ground, especially by walking on it or driving a vehicle over it :
The lawn had been churned up by the tractor.
churn something ↔ up
The lawn had been churned up by the tractor.2 to move water, mud etc around violently
churn something ↔ up
The oars had churned up the mud, clouding the water.
The oars had churned up the mud, clouding the water.3 British English to make someone upset or angry :
Though she looked calm, in reality she was churned up inside.
Though she looked calm, in reality she was churned up inside.