危き険けん日び

noun

unsafe day; fertile day

Refers to a day in the menstrual cycle when unprotected sex is likely to result in pregnancy. Often used in the context of contraception or family planning.

• 今日きょうは危き険けん日びだから、気きをつけて。

  Today is an unsafe day, so be careful.

• 危き険けん日びを避さけて性せい交こうする。

  Avoid intercourse on unsafe days.