Synonyms of 'euphemism'
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If you say that a statement is an understatement, you mean that it does not fully express the extent to which something is true.
To say I'm disappointed is an understatement.
Thesaurus for euphemism from the Collins English Thesaurus
A euphemism is a polite word or expression that is used to refer to things which people may find upsetting or embarrassing to talk about, for example sex, the human body, or death.