一不小心 (yī bú) — accidentally, due to a moment of carelessness

Definição

Set phrase for a brief lapse in attention — 'one careless moment and…'. It sets up a regretful outcome, often followed by 就 to show what went wrong.

idiom

accidentallydue to a moment of carelessness

一不小心。
yī bú Jiù shuāi dǎo le.
With one careless moment, I fell down.
一不小心。
Kāi chē de shí hou yī bú jiù huì chū shì.
When driving, one moment of inattentiveness can cause an accident.
一不小心。
Tā yī bú shuō cuò le huà.
He accidentally said the wrong thing.

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