Calling a violent storm "a bit of wind" is:

1. Understatement is an expression of lesser strength than what is meant. 2. A violent storm is described as "a bit of wind". 3. The words are weaker than the reality, which is the mark of understatement. 4. Hyperbole would do the reverse and exaggerate. 5. A euphemism would soften an unpleasant word, not play down a fact. 6. So the phrase is understatement. **Why the other options fail:** - Hyperbole exaggerates, so it does the opposite. - A euphemism replaces an offensive word with a gentler one. - A metaphor names one thing as another. _Source: Wikipedia, "Understatement", section "introduction" (revision 1330631915)_