understatement
un·ders·ta·tement
noun
1.
a statement that is restrained in ironic contrast to what might have been said
Origin
From under- + statement or understate + -ment.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.