eaves gutter; rain gutter; roof gutter
A gutter attached along the eaves of a roof to channel rainwater away.
The eaves gutter is clogged, so I have to clean it.
新しい家には銅製の軒樋が付いている。
The new house has copper eaves gutters.
Compound of 軒 (のき, 'eaves') and 樋 (どい, 'gutter, pipe'). The reading どい is a rendaku form of とい.