To chafe at the bit, of horses.

To chew without swallowing, as of chewing tobacco.

To chew (food); SYN. masticate, manducate, jaw.

ETYM Prov. Eng. and Colloq. U. S.
To chew noisily; SYN. champ.

1. To grind or crush with, or as with, the teeth and prepare for swallowing and digestion; to chew
2. To chew; to knead mechanically

ETYM Latin masticatio: cf. French mastication.
The act or operation of masticating; chewing, as of food.