noun

• (countable) That which is chewed.
• (Appalachia, informal, uncountable) Chewing tobacco.
  "When the doctor told him to quit smoking, Harvey switched to chaw, but then developed cancer of the mouth."

verb

• (archaic or nonstandard outside dialects, e.g. Appalachia, Southern US) To chew; grind with one's teeth; to masticate (food, or the cud).
  "The trampling steede, with gold and purple trapt,"
• (obsolete, transitive) To ruminate (about) in thought; to ponder; to consider.
  ""I home retourning, fraught with fowle despight, And chawing vengeaunce all the way I went, Soone as my loathed love appeard in sight, With wrathfull hand I slew her innocent;"
• (UK, slang) To steal.
  "Some pikey's chawed my bike."
• (dialectal, intransitive) To be sulky.

noun

• (obsolete) The jaw.
  "all the poison ran about his chaw"