Understatement

That's an understatement!

There are whole cultures where understatement is bred in the bone. In New England one hears as satisfaction: "It's better than a poke in the eye with a sharp stick."

That's an understatement.

That's something of an understatement.

That would be an understatement.

Saying that the World Cup sparked interest in soccer in America might be an understatement.

That's the understatement of the millennium!

That may be an understatement.

That's probably an understatement.

That's quite an understatement.

A master of understatement

And that mode of expression is very demurring and self-deprecating. Victorian English was all about understatement.

Now that's an understatement.