Examples from the Web for chaw
I tell ye what you do: Give him a bone or a chunk of tough meat to chaw on.The Woman-Haters
Joseph C. Lincoln
“Might chaw on a biscuit before I take another nap,” yawned the prisoner.The Coyote
Ain't you afraid that you might take a chaw on it, by mistake for your tobacco?Frontier Boys in Frisco</p>
Then he inquired as an afterthought: “Would he snap or chaw me up a-tall?”'Me-Smith'
Not so much as a chaw of bacon, or a blanket to lay over you nights.The Huntress
- to chew (tobacco), esp without swallowing it
- something chewed, esp a plug of tobacco
Word Origin and History for chaw
1520s, unexplained phonetic variant of chew (v.). OED points out the variant form chow was "very common in 16-17th c." Bartlett's "Dictionary of Americanisms"  says chaw, "Although found in good authors, ... is retained, in this country as in England, only by the illiterate." Related: Chawed; chawing. The noun meaning "that which is chewed" (especially a quid of tobacco) first recorded 1709.