churn

Concise Oxford English Dictionary © 2008 Oxford University Press:
churn/tʃɜːn/

▶noun

• 1 a machine for making butter by agitating milk or cream.

• 2 Brit. a large metal milk can.

▶verb

• 1 agitate (milk or cream) in a churn to produce butter.

• 2 move (liquid) about vigorously.

• 3 (churn something out) produce something in large quantities and without thought.

• 4 (as adj. churned up) upset or nervous.

– origin OE cyrin, of Gmc origin.