一言為定

yìyánwéidìng

that's settled then

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yi1 yan2 wei2 ding4

one word and it's settled (idiom); It's a deal!, That's settled then.

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一言為定|一言为定 [yī yán wéi dìng] ► one word and it's settled (idiom); It's a deal! ► That's settled then.