Not one to throw at a dog: Proverbial: not one word if her life depended on it.

curs: dog, mastiff, watch-dog

childes Father: a cheeky reference to Orlando, the future father of her child, prompting Celia's response of surprise that Rosalind should like him this much already.

kinde of chase: course of argument, line of reasoning

deserve well: merit my hatred (according to this line of reasoning).