Question

what is understatement?
describing something as smaller or less significant than it actually is
the use of extreme exaggeration to make a point
the use of language that states the opposite of what is actually meant
verbal irony employed to mock, ridicule, or criticize

Explanation:

Understatement is a figure - of - speech where something is described as being smaller, less important, or less significant than it actually is.

Answer:

describing something as smaller or less significant than it actually is