A Good Deal Meaning

(idiomatic) Very much; to a great extent; a lot; lots.

Example:   We had a good deal more money afterwards.
1865, Lewis Carroll, Alice's Adventures in Wonderland, Chapter 5: Advice from a Caterpillar,
  She was a good deal frightened by this very sudden change, but she felt that there was no time to be lost, as she was shrinking rapidly: so she set to work at once to eat some of the other bit.