1To incur a loss (especially money); to lose money or suffer a financial loss.
株で大きく損したので、しばらく取引を休むつもりだ。
I lost a lot in stocks, so I plan to take a break from trading for a while.
安いと思って買ったら送料で損した。
I thought it was cheap, but I lost out because of the shipping cost.
あのプランだと長期的に損する可能性が高い。
That plan is likely to be disadvantageous in the long run.
2To waste one's time or efforts; to have efforts come to nothing.
そんなに急いでも結局は損するだけだよ。
Rushing like that will only make you worse off in the end.
今行っても待たされるだけで損するから、あとで来よう。
If we go now we'll just be made to wait and it'll be a waste, so let's come later.
彼のアドバイスは役に立たず、時間を損したと思った。
His advice wasn't helpful; I felt my time was wasted.