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That's putting it mildly

That is an understatement. That's saying it without any exaggeration. A: "Gosh, it is downright balmy out!" B: "That's putting it mildly! I feel like I'm melting!" The new manager is a bit of a hothead—and that's putting it mildly!
See also: mildly, put

to put it mildly

To underemphasize or downplay something. This phrase is typically used without conjugating the infinitive "to put." A: "Oh, it was just a rain storm." B: "Yeah, to put it mildly. It was more like a hurricane!"
See also: mildly, put
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

to put it mildly

 and put it mildly
to understate something; to say something politely. (Note the variation in the examples.) She was angry at almost everyone—to put it mildly. To say she was angry is putting it mildly. To put it mildly, she was enraged.
See also: mildly, put
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

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]
See also: mildly, put
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

put it ˈmildly

used for showing that you could have said something much stronger or more critical, etc: He was annoyed, to put it mildly (= he was very angry).‘She said you didn’t like it.’ ‘That’s putting it mildly — it’s hideous!’
See also: mildly, put
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
2003 strongly agree 31% mildly agree 17% mildly disagree 19% strongly disagree 31% don't know/refused 3%
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We recently received a mildly flattering letter from the International Association of Business Communicators.
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In a well-designed study sponsored by the Finnish company that developed the margarine, 102 people with mildly elevated cholesterol (235 or higher) who ate three pats of Benecol every day for a year lowered their cholesterol by an average of ten percent.(1) Cholesterol didn't fall in 51 people who were given a similar margarine without stanol esters.
Since fossil fuel use is the culprit in the greenhouse effect, this is at least mildly encouraging news.
Sheriff Lindsay Foulis decreed it is not a derogatory term because it can only be deemed to be "mildly offensive".
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The tympanic membrane was in its normal position and was mildly scarred.
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The symbolism of any individual element is refracted by the other associations he sets up, so that every scene inspires a host of dynamic readings mildly at odds with the others.