noun
downpipe; drainspout; vertical gutter
A vertical pipe attached to the outside of a building that carries rainwater from the roof gutter down to the ground or a drain.
雨どいの縦樋が詰まっている。
The downpipe of the rain gutter is clogged.
新しい縦樋を取り付ける工事をした。
We had work done to install a new downpipe.
Compound of 縦 (tate, 'vertical') and 樋 (toi, 'gutter/pipe'). The reading たてどい is a standard rendaku form.