In overstatement the diction exaggerates the subject, and in understatement the words play down he magnitude or value of the subject. Overstatement is also called hyperbole.Both aim at the same effect: to make the statement or description impressive or interesting. 通俗了说就是Overstatement是往好的方面夸张,Understatement是往坏的方面夸张。例句:His friends praised his daughter's performances to the skies.(Overstatement) It took a few dollars to build his indoor swimming pool.(Understatement) 以上仅供参考。