yì​jié​jīn​lán

to become sworn siblings

义结金兰 義結金蘭 yì​jié​jīn​lán
to become sworn siblings
To form a deep and lasting friendship; to become sworn brothers or sisters; the phrase originates from the 易经 yì​jīng comparing the strength of a bond to metal and its fragrance to orchids

Frequency

Written text
0.061 per million

Sources

Frequency data
BCC Corpus (BLCU)