To chew the cud

Also found in: Idioms.
to chew the food over again, as a cow; to ruminate; hence, to meditate.
to ruminate; to meditate; used with of; as, to chew the cud of bitter memories.

See also: chew, Cud

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
Which sentiment being a pretty hard morsel, and bearing something of the air of a paradox, we shall leave the reader to chew the cud upon it to the end of the chapter.
She said: "I'm very happy to treat him to a roll, vegan or not, and to chew the cud on jobs and growth in the North."
For OEMs, distributors and dealers, these years also served as an invaluable experience in introspection, allowing players in the region to chew the cud, cut the fat and emerge all the wiser.