一不做，二不休
yī bù zuò , èr bù xiū
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1 don't do it, or don't rest (idiom); either give up, or go through to the end
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2 Since we started, we must carry it through whatever happens.
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3 in for a penny, in for a pound
一干二净
yī gān èr jìng
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1 thoroughly (idiom)
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2 completely
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3 one and all
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4 very clean
一分为二
yī fēn wéi èr
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1 one divides into two
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2 to be two-sided
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3 there are two sides to everything
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4 to see both sb's good points and shortcomings (idiom)
一哭二闹三上吊
yī kū èr nào sān shàng diào
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1 to make a terrible scene (idiom)
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2 to throw a tantrum
一回生二回熟
yī huí shēng èr huí shú
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1 unfamiliar at first, but well accustomed soon enough (idiom)
一山不容二虎
yī shān bù róng èr hǔ
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1 lit. the mountain can't have two tigers (idiom)
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2 fig. this town ain't big enough for the two of us
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3 (of two rivals) to be fiercely competitive
一心二用
yī xīn èr yòng
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1 to do two things at once (idiom)
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2 to multitask
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3 to divide one's attention
一是一，二是二
yī shì yī , èr shì èr
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1 lit. one is one, two is two (idiom)
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2 fig. things are (or ought to be) perfectly clear-cut
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3 unequivocal
一清二楚
yī qīng èr chǔ
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1 to be very clear about sth (idiom)
一清二白
yī qīng èr bái
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1 perfectly clean
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2 blameless
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3 unimpeachable (idiom)
一石二鸟
yī shí èr niǎo
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1 to kill two birds with one stone (idiom)
丈二和尚，摸不着头脑
zhàng èr hé shang , mō bu zháo tóu nǎo
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1 lit. like a three-meter high monk, you can't rub his head (idiom)
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2 fig. at a total loss
三七二十一
sān qī èr shí yī
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1 three sevens are twenty-one (idiom)
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2 the facts of the matter
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3 the actual situation
三心二意
sān xīn èr yì
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1 in two minds about sth (idiom)
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2 half-hearted
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3 shilly-shallying
不知丁董
bù zhī Dīng Dǒng
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1 forgetting the fate of Ding and Dong (idiom)
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2 unheeding the lessons of the past
九牛二虎之力
jiǔ niú èr hǔ zhī lì
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1 tremendous strength (idiom)
二虎相斗，必有一伤
èr hǔ xiāng dòu , bì yǒu yī shāng
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1 lit. when two tigers fight, one is sure to be wounded (idiom)
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2 fig. if it comes to a fight, someone will get hurt
二话不说
èr huà bù shuō
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1 not saying anything further (idiom); not raising any objection
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2 without demur
只知其一，不知其二
zhǐ zhī qí yī , bù zhī qí èr
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1 to know the first, but not know the second (idiom); only partial information