outside chance

idiomatic

(idiomatic) A small likelihood; a remote possibility.

Japanese Meaning

微かな可能性、僅かな希望 (非常に低い確率で起こる可能性)

There's an outside chance we'll finish the project by Friday if nobody gets sick.

誰も病気にならなければ、金曜日までにプロジェクトを終えられるというわずかな可能性がある。

Sense（1）

(idiomatic) A small likelihood; a remote possibility.

Then, perhaps, there may be a chance of detecting him; but it's an outside chance.

outside chances

（ plural ）