Idioms and Phrases with save up
Accumulate something for a particular purpose, as in Jan had been saving up her allowance for a new bicycle. [First half of 1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.