水みず落おとし

noun

draining water from pipes (for winter)

Refers to the seasonal task of draining water from pipes, typically to prevent freezing damage in winter. Often used in household or maintenance contexts.

See also: 水抜き

• 冬ふゆになる前まえに、家いえの水みず落おとしを忘わすれずにしてください。

  Before winter comes, please don't forget to drain the water from the pipes in your house.