chew

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To bite and grind with the teeth; masticate.
• intransitive verb To meditate on; ponder.
• intransitive verb To make a crushing and grinding motion with the teeth.
• intransitive verb To cogitate; meditate.
• intransitive verb Informal To chew tobacco as a habit.
• noun The act of chewing.
• noun Something held in the mouth and chewed, especially a plug of tobacco.
• idiom (chew the cud) To ponder over; meditate.
• idiom (fat/rag) To talk together in a friendly, leisurely way; chat at length.

from The Century Dictionary.

• noun That which is chewed; that which is held in the mouth at one time; especially, a quid of tobacco.
• To bite and grind with the teeth; masticate, as food, preparatory to swallowing and digestion.
• Figuratively, to ruminate on in the thoughts; meditate on.
• Synonyms Bite, Gnaw, etc. See eat.
• To perform the act of biting and grinding with the teeth; champ; ruminate. Specifically
• To press or grind tobacco between the teeth for the sake of its flavor or stimulating effects.
• Figuratively, to meditate; reflect.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb To perform the action of biting and grinding with the teeth; to ruminate; to meditate.
• transitive verb To bite and grind with the teeth; to masticate.
• transitive verb To ruminate mentally; to meditate on.
• transitive verb to chew the food over again, as a cow; to ruminate; hence, to meditate.
• noun Law That which is chewed; that which is held in the mouth at once; a cud.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A small sweet, such as a taffy, that is eaten by chewing.
• noun informal, uncountable Chewing tobacco.
• noun countable or uncountable A plug or wad of chewing tobacco; chaw or a chaw.
• verb To crush with the teeth by repeated closing and opening of the jaws; done to food to soften it and break it down by the action of saliva before it is swallowed.
• verb To grind, tear, or otherwise degrade or demolish something with teeth or as with teeth.
• verb informal To think about something; to ponder; to chew over.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a wad of something chewable as tobacco
• verb chew (food); to bite and grind with the teeth
• noun biting and grinding food in your mouth so it becomes soft enough to swallow