a good deal

From deal (“(obsolete) division, portion, share”)

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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 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.

• a great deal

a good deal (uncountable)

1. (idiomatic) A large amount; a lot.

   He made a good deal of trouble for us.

   • 1838, Edgar Allan Poe, How to Write a Blackwood Article:

     You may make a good deal of that little fact if properly worked.

• a great deal