損する (sonsuru) means “lose money” | MotiTan Japanese Dictionary

More examples

安さだけで選ぶと、あとで損します。yasu sa da ke de era bu to a to de son shi ma su

If you choose based only on price, you will lose money later.

Describes ending up with less money or a less favorable result than expected.

金銭や利益を失い、結果的に不利になること。kin sen ya ri eki o ushina i kek ka teki ni fu ri ni na ru ko to

The Sino-Japanese element 損 (son, "loss") combines with する (suru, "do") to form a verb meaning to end up suffering a loss.

In conversation, 損する (son suru) often appears as 損した (son shita) when someone realizes that a choice or deal was unfavorable.