it's on

Phrase

colloquial

(colloquial) A conflict is starting.

Japanese Meaning

喧嘩や対決、衝突が始まろうとしている状態 / 争いや論争が勃発しようとしている状況

As soon as Jake stepped into the ring and stared down his opponent, he growled, 'it's on'.

ジェイクがリングに足を踏み入れ、相手をにらみつけると、彼はうなり声を上げて「やるぞ」と言った。

Sense（1）

(colloquial) A conflict is starting.

[A man from a competing gang throws a drink in Fred's face, just before a fight begins.]

Fred Alger (Mel Tormé): It's on!