Wiktionary
and then some
phr. (context idiomatic colloquial English) (non-gloss definition: Used to confirm preceding utterance, while implying that what was said or asked is an understatement)
WordNet
and then some
adv. and considerably more in addition; "it cost me a week's salary and then some"
Usage examples of "and then some".
When some cheap racketeering rabble-rousers come around trying to stir up trouble, they can't help getting sore, and then somebody may get hurt.