Understatement is a form of speech or disclosure which contains an expression of less strength than what would be expected. This is not to be confused with euphemism, where a polite phrase is used in place of a harsher or more offensive expression.
Understatement is a staple of humor in English-speaking cultures, especially in British humor. For example, in Monty Python's The Meaning of Life, a suburban dinner party is invaded by Death, who wears a long black cloak and carries a scythe. "Well," says one party guest, "that's cast rather a gloom over the evening, hasn't it?" In another scene, an Army officer has just lost his leg. When asked how he feels, he looks down at his bloody stump and responds, "Stings a bit."
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