Idioms and Phrases with pretty much
Almost, nearly, approximately, as in Our homework was pretty much finished. This adverbial usage differs from the use of pretty for “considerable” (as in pretty penny). [c. 1800]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.