勝負だ

let's compete

→ 勝負
phrase Rare #26,165
let's compete A forceful way to challenge someone or declare that it is time to settle the outcome. Depending on context, it can also mean “it's a showdown” or “it's a close match.”
JA: ここからが勝負だ。
EN: This is where the real competition begins.

高速勝負だ

Let’s settle this with speed.

— TAXi (1998)

さあバカども勝負だ

Come on, you idiots—let's settle this!

— きっと、うまくいく (2009)

今度押して来たら勝負だ

If you push me again, we'll settle this.

— 七人の侍 (1954)

ボブスケートではきみといい勝負だ

Bob is about as good as you at skating.

勝負だ

Let's settle this!

— きっと、うまくいく (2009)

勝負だ

Let's settle this!

— アバウト・タイム ~愛おしい時間について~ (2013)