What is to ruminate in thought; to consider; to keep the mind working upon; to brood over. Dryden. Note: A word formerly in good use, but now regarded as vulgar called?

chaw — To ruminate in thought; to consider; to keep the mind working upon; to brood over. Dryden. Note: A word formerly in good use, but now regarded as vulgar. (Webster's 1913.)

Sources