One false move and the bomb might blow up.

一步弄错，炸弹就可能会爆炸。

《牛津词典》

One False Move, And You Know What?

走错一步 你知道会怎样吧?。

youdao

One false move and you know what, I can't do anything to help you.

如果再犯错，你知道吗，我就无能为力了。

youdao

One false move and they could be delayed, which means they should have a greater chance of being seen and getting caught.

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Just one false move and they are out.

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Every false move seems to lead to another, more disastrous than the one before.

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