Understatement

An understatement is a figure of speech that has the effect (and sometimes, the purpose) of making something appear to be less important than it actually is. It is a core feature of British humour and comedy. In rhetoric, it is known as litotes. The opposite of understatement is embellishment.

What is an understatement?
An understatement is a figure of speech; the term 'figure' indicates that its form is more important than its content when it comes to communicating its meaning. Understatement is better interpreted as a holistic entity, which gains its meaning from its structural relations to other linguistic entities. This "holism" manifests itself, primarily, in the way in which the phonological (e.g., tone, amplitude), grammatical, semantical, and pragmatic features are combined. For instance, an understatement may be used in combination with other linguistic entities, to develop irony and sarcasm. For example, in situations where an intense response (either positive or negative) is expected, understatement offers contrast which can reduce the intensity of the situation; downplaying its seriousness and inducing humour.

Psychology
Understatement can be used in the psychological form of deception called "minimisation": involving the combination of denial and rationalisation in circumstances where complete denial would be implausible.

Examples

 * This guy is in the White House