Fetching details from the dictionary...
to swell up; to bulge
to swell (of a budget, population, etc.); to increase significantly; to balloon
借金が膨れ上がった。
The debt swelled up.
費用が膨れ上がっている。
Expenses are ballooning.
人口が急速に膨れ上がる問題がある。
There is a problem of the population swelling rapidly.