Is there a term for "coalition failure" in a PR election?

[Silent Hunter]

Basically, when an overall coalition of parties loses an election despite the main party gaining a plurality of votes (indeed increasing its share) because the junior parties collapse?

Denmark's last election for example.

[Former President tack50]

I've seen the derogatory term "coalition of losers" used over here sometimes, particularly by PP, who often won elections with a plurality but was ousted because of a lack of allies.

Then again that doesn't really apply to explicit coalitions made before the election I guess

[DC Al Fine]

I think we usually just say 'X party lost thanks to Y party's collapse'