a world of
a world of (something)
A very large amount of something. I know the old house seems run down, but a thorough cleaning and a fresh coat of paint will make a world of difference. If you're feeling sad, getting out in the sunlight should do you a world of good.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
a (or the) world ofa very great deal of.
Farlex Partner Idioms Dictionary © Farlex 2017