V就V【V jiù V】

V就V accepts something and moves on: it's happened, or it's going to, and there's no point fussing. The next clause usually says what to do instead. It's spoken.

With an adjective or a verb still to happen, 吧 often follows.

Taking up a challenge

Said back to someone who has pushed you, the same frame accepts the challenge, with an edge.

This sounds defiant, so it's not for a boss or a stranger.

The same word twice

Both sides are the same verb or adjective, and nothing sits between them except 就 (and 了 before it).

• × 去就走 → 去就去

要V就V, "if you're going to, do it properly", and 想V就V, "do it whenever you like", are separate patterns.