shǔ​jiǔ

nine periods of nine days

数九 數九 shǔ​jiǔ
nine periods of nine days
the nine nine-day periods following the winter solstice, traditionally considered the coldest time of the year
to enter the winter periods
to enter the period of the nine nine-day cycles following the winter solstice

Frequency

Written text
0.255 per million

Cross-References

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Sources

Frequency data
BCC Corpus (BLCU)