決断を下した

made a decision

→ 決断
phrase Rare #32,614
made a decision A formal expression meaning to make or reach a decision. 決断を下す is the dictionary-form expression; 下した is its past tense.
JA: 彼女は海外で働く決断を下した。
EN: She made the decision to work abroad.

決断を下したのはクルー

It was the whole crew who made the decision.

— オデッセイ (2015)

私がその決断を下したです

I’m the one who made that decision.

裁判官はその囚人有罪である決断を下した

The judge ruled that the prisoner was guilty.

トムその決断を下した人です

Tom is the person who made that decision.