도산이 · 도산을
bankruptcy, business failure
Example
경기가 나빠지면서 많은 중소기업이 도산했어요.
As the economy got worse, many small and midsize companies went under.
Word parts
도 topple+산 property
Literally 'property toppling over'.
Good to know
도산 is used for companies; for individuals, 파산 is the usual word.