一诺千金 (yī nuò qiān jīn)

lit. a promise worth a thousand pieces of gold (idiom); fig. a promise

Character breakdown

Usage

他一诺千金,答应的事一定会做到。

His word is as good as gold; he always keeps his promises.

Tā yīnuòqiānjīn, dāyìng de shì yīdìng huì zuòdào.