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不充分如實(shí)的陳述；輕描淡寫的說明
If you say that a statement is an understatement, you mean that it does not fully express the extent to which something is true.
例句
To say I'm disappointed is an understatement...
說我失望那是說得太輕了。
He was getting very hard to live with, and that's the understatement of the year.
說他很不好相處，那簡直是說得太客氣了。