add up to something

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++add up to something  → add up to something at add(PHRASAL VERB) to produce a particular total or result

add up to something  

add up to something
add up to something phrasal verb (see also add)
to produce a particular total or result:
    Rising prison population and overcrowding add up to a real crisis.