退勢 たいせい挽回 ばんかいではありませんでした
taiseibankaidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 退勢挽回

1. Was not a reversal of the declining situation.; Was not able to turn the tide.

Past/Perfective
Negative
Polite
Formal Register