衰すい勢せい

noun

decline; downward tendency; decay

Refers to a waning of power, influence, or vitality; often used in formal or written contexts about nations, organizations, or trends.

• その国くにの衰すい勢せいは誰だれの目めにも明あきらかだった。

  The decline of that country was obvious to everyone.

• 会かい社しゃの衰すい勢せいを食くい止とめるために、新あたらしい戦せん略りゃくが必ひつ要ようだ。

  A new strategy is needed to halt the company's downward trend.