jīn​kǒu​yù​yán

authoritative command

金口玉言 jīn​kǒu​yù​yán
authoritative command
Originally used for an emperor's decree; now used to describe words of great authority or commands that cannot be changed, often said with sarcasm.
precious advice
Valuable or beneficial words that are deeply insightful or enlightening.
close-mouthed
To be tight-lipped or reluctant to speak; keeping one's mouth shut

Frequency

Written text
0.060 per million

Sources

Frequency data
BCC Corpus (BLCU)