三九

sānjiǔ
  1. from the 19th day to the 27th day after the winter solstice
  2. the coldest weather days of winter

Wiktionary

Entry Composition

=1 三 Sān surname San
=1 三 sān
  1. three
  2. 3
2 九 jiǔ
  1. nine
  2. 9

Containing this entry

三九天 sānjiǔtiān the twenty seven days after the Winter Solstice, reputed to be the coldest days of the year