put it mildly
Understate, say without exaggeration, as in It's a fairly long way to walk, to put it mildly—twenty miles or so. [First half of 1900s]
TAKE THIS QUIZ IF A DAZZLING VOCABULARY IS YOUR DESIDERATUM!
Question 1 of 7
What does “clement” mean?
Words nearby put it mildly
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.