Chawed
In Chapter 2 of Great Expectations "chawed" is a dialect of "chewed". Dickens often spells the word the way the working class or down trodden people pronounce them, to capture their regional speech. When Joe Gargery says chawed, he simply means chewed - to bite and grind food with teeth. The spelling "chaw" was common dialect. It also reflects the Joe's humble background and limited education. Take note of the fact that Elementary Education Act ( also known as the Forster Act) was passed in 1870 only.