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一言既出,驷马难追
一言既出,駟馬難追
yīyánjìchū,sìmǎnánzhuī
1. lit. once said, a team of horses cannot unsay it (idiom); a promise must be kept

Character Breakdown

一
yī
one; a, an; alone
HSK 1 1 丶
言
yán
words, speech; to speak, to say
HSK 4 7 丶
既
jì
already, since, then; both; de facto
HSK 4 9 丶
出
chū
to go out, to send out; stand; produce
HSK 1 5 丶
驷
sì
a team of four horses
8 丶
马
mǎ
horse; surname
HSK 3 3 丶
难
nán
hard, difficult, arduous; unable
HSK 3 10 丶
追
zhuī
to pursue, to chase after; to expel
HSK 5 9 丶

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