if water, mud, etc. churns, or if something churns it (up), it moves or is moved around violently

if your stomach churns or if something churns your stomach, you feel a strong, unpleasant feeling of worry or fear

My stomach churned as the names were read out.

to make somebody feel upset or emotionally confused

It churns me up inside to think what might have happened.

Conflicting emotions churned inside him.

to turn and mix milk in a special container in order to make butter

a machine in which milk or cream is shaken to make butter

a large metal container in which milk was carried from a farm in the past

the number of people who stop using a product and change to another or who leave the company they work for and go to another

LEARNit Dictionary