食言

nǐ fàng xīn tā bù huì shí yán

你放心，他不会食言。

I assure you he is as good as his word.

shí yán bèi yuē

食言背约

go back on one's word

rú guǒ tā dā ying bāng máng tā jiù jué bù shí yán

如果他答应帮忙，他就绝不食言。

If he promised to help, he will not go back on his promise.

tā dā ying bǎ shū liú gěi tā men zhī hòu què shí yán ér bǎ tā mài gěi le bié rén

他答应把书留给他们之后，却食言而把它卖给了别人。

After promising to keep the book for them, he broke his word and sold it to someone else.

yǒng bù shí yán

永不食言

never go back on one's word

dé zhī tā men shí yán bìng bù ràng rén jué de hěn yì wài

得知他们食言并不让人觉得很意外。

It comes as no surprise to learn that they broke their promises.

tā yòu yī cì shí yán zhè ràng rén zài yě wú fǎ róng rěn xia qu le

他又一次食言，这让人再也无法容忍下去了。

He’d broken his promise again, and it was the last straw.