Chinese–EnglishWith examples

一旦

yī dàn · yi dan

Same in simplified and traditional Chinese

HSK 5

Meaning

CC-CEDICT
  1. in case (sth happens)
  2. if
  3. once (sth happens, then...)
  4. when
  5. in a short time
  6. in one day
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In a conversation

0:19 cartoon

One episode only

  1. Liangliang

    我(wǒ)一旦(yīdàn)开始(kāishǐ)看(kàn)电视剧(diànshìjù)，就(jiù)停(tíng)不下来(bùxiàlái)。

    Once I start watching a TV series, I can't stop.

  2. Dengdeng

    我(wǒ)也(yě)是(shì)，一旦(yīdàn)开始(kāishǐ)，就(jiù)看(kàn)到(dào)半夜(bànyè)。

    Me too. Once I start, I watch until midnight.

  3. Liangliang

    今晚(jīnwǎn)只(zhǐ)看(kàn)一集(yījí)，好(hǎo)吗(ma)？

    Tonight, only one episode. Okay?

  4. Dengdeng

    好(hǎo)，一旦(yīdàn)看完(kànwán)一集(yījí)，我们(wǒmen)就(jiù)关(guān)电视(diànshì)。

    Okay. Once we finish one episode, we turn off the TV.

  5. Liangliang

    咦(yí)，天(tiān)怎么(zěnme)亮(liàng)了(le)？

    Huh, why is it getting light outside?

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In a sentence

2 examples
01

她(tā)一(yí)旦(dàn)开(kāi)始(shǐ)说(shuō)话(huà)，就(jiù)很(hěn)难(nán)让(ràng)她(tā)停(tíng)下(xià)来(lái)。

Once she starts talking, she is hard to stop.

Tatoeba: Chinese by egg0073 · English by CH · CC BY 2.0 FR. Simplified Chinese conversion; Pinyin added or corrected.

02

你(nǐ)一(yí)旦(dàn)不(bú)做(zuò)个(gè)乖(guāi)孩(hái)子(zi)，圣(shèng)诞(dàn)老(lǎo)人(rén)就(jiù)不(bú)会(huì)来(lái)噢(o)。

If you don't behave, Santa won't come.

Tatoeba: Chinese by mirrorvan · English by CK · CC BY 2.0 FR. Pinyin added or corrected.

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Mainland China stroke order, including traditional characters. Drawing sources & licenses.

Definitions adapted from CC-CEDICT, published by MDBG and its contributors, under CC BY-SA 4.0. Pinyin display and entry grouping have been adapted.

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