プログレッシブ和英中辞典(第4版)の解説
かさむ【×嵩む】
費用がかさんだ
The expenses have piled [run] up.
出費が思ったよりかさんだ
The expenses amounted [ran up] to a larger sum than I had expected.
借金がかさんでしまった
I have 「gone deep [gotten deeply] into debt.
そんなに美食をしていたら食費がかさんでしまうぞ
If you keep having such fancy meals, your food bill will go sky high.