一
旦

About

The word "一旦" is formed by combining the character "一" (meaning "one") with "旦" (meaning "dawn", pictographically showing the sun above the horizon). This literal combination of "one dawn" denotes a single, specific point in time, which extends to function as an adverb meaning "once" or "in case", indicating a hypothetical event occurring at that definite moment.

Example Sentences Hide

一旦下雨，我们就回家。

Yīdàn xià yǔ, wǒmen jiù huí jiā.

Once it rains, we will go home.

一旦你决定，就要坚持下去。

Yīdàn nǐ juédìng, jiù yào jiānchí xiàqù.

Once you make a decision, you must stick to it.

一旦发生意外，请立即联系我。

Yīdàn fāshēng yìwài, qǐng lìjí liánxì wǒ.

In case of an accident, please contact me immediately.

一旦公司上市，股价可能会大涨。

Yīdàn gōngsī shàngshì, gǔjià kěnéng huì dà zhǎng.

Once the company goes public, its stock price may rise sharply.

一旦全球变暖加剧，生态系统将面临崩溃。

Yīdàn quánqiú biànnuǎn jiājù, shēngtài xìtǒng jiāng miànlín bēngkuì.

Once global warming intensifies, the ecosystem will face collapse.

Word Definition - 一旦

yī dàn in case (sth happens); if; once (sth happens, then...); when; in a short time; in one day

Individual Character Details

一 yī
旦 dàn