N-COUNT
不充分如实的陈述；轻描淡写的说明
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...
说我失望那是说得太轻了。
He was getting very hard to live with, and that's the understatement of the year.
说他很不好相处，那简直是说得太客气了。