make a bundle

Also, make a pile. Make a great deal of money, as in When the market went up they made a bundle, or He made a pile from that department store. The first term, dating from about 1900, comes from the somewhat earlier use of bundle for a roll of banknotes. The variant, alluding to a heap of money, was first recorded in 1864.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.