"我的朋友输了。"

Translation: My friend lost.

[Karoliina765050]

'My friend has lost' should be accepted.

[DestinationVoid]

Huh? Perhaps it should be 'My friend is lost' ?

[NasuSamaruk0]

In this context, the sentence is referring to "competition loss/to be defeated" instead of "being lost in certain location". Though the meaning is "to lose", it is different from "to be lost", which is 迷路.

Since it's the single sentence, there are more than a possible case that can occur. Of course, the characters used in certain sentences vary.

[J.Sol.Esp]

No. My friend lost the match or game. I think "diu" means lost in the sense you mean.

[DebbieJust]

My friends lost should also be accepted. I will report it