Sentence:  “Wy, <WSD>mum</WSD>,” said Mr. Weller, “I don′t think you′ll see a many sich, and that′s the truth. But if my son Samivel vould give me my vay, <WSD>mum</WSD>, and dis-pense with his—"might" I wenter to say the vurd?” / “What word Mr Weller?” said the housekeeper, blushing slightly. / “Petticuts, <WSD>mum</WSD>,” returned that gentleman, laying his had upon the garments of his grandson. “If my son Samivel vould only dis-pense vith these here, you′d see sich a alteration in his appearance, as the imagination can′t depicter!” 
Meaning of the word marked with <WSD> tags:  ma'am; a term of respect for an older woman.