yuē​fǎ​sān​zhāng

to agree on basic rules

约法三章 約法三章 yuē​fǎ​sān​zhāng
to agree on basic rules
Originally referring to the three simple laws established by the first Han emperor to replace harsh Qin laws; now used to mean setting a few simple rules or a preliminary agreement to be followed by all parties

Frequency

Movie subtitles
0.300 per million appears in 0% of films
Written text
0.471 per million

Sources