Rumination
<B>1.</B> Regurgitating food after a meal and then swallowing and digesting some of it.
Cattle and other ruminant animals have a four-chambered stomach for the rumination of food and so can chew their cud.
Some people, particularly infants, engage in something similar by regurgitating food after a meal and then swallowing and digesting some of it.
<B>2.</B> Obsessive rumination is the preoccupation with certain thoughts