understatement

"To say he was a little upset when his team lost would be an understatement"

"Please don't make an understatement about how serious this situation is"

"Calling that mountain 'a big hill' is quite an understatement"

"Saying the puppy was 'a bit messy' after playing in the mud was a huge understatement"

"Is it an understatement to say you're hungry after not eating all day?"