expression, godan verb (-mu)
get deeper in debt; pile up debts
Fixed expression meaning debts accumulate or increase, often implying a worsening financial situation.
無職のままでは借金がかさむ一方だ。
If I stay unemployed, my debts will just keep piling up.
カードローンで借金がかさんでしまった。
My debts have piled up because of the card loan.