a good deal

From deal (“division, portion, share”). Compare a great deal, etc.

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a good deal (not comparable)

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

   We had a good deal more money after winning the lottery.

   • 1835, James Hogg, The Story of Euphemia Hewit:

     He said he was sometimes whistling a tune to himself — for, like me, he sawed a good deal on the fiddle; […]

   • 1865, Lewis Carroll, “Chapter 5: Advice from a Caterpillar”, in Alice's Adventures in Wonderland:

     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.

• a great deal

• good deal (for noun senses)