vertical trench; ascending trench; slope trench
A trench or pathway cut into a natural slope, often used in fortifications or siege works. Contrasts with 横堀 (よこぼり), a horizontal trench.
See also: 横堀 (よこぼり)
A vertical trench was dug into the slope for the castle's defense.
The ascending trench served to hinder the movement of attackers.
Standard kanji form for this term, using 竪 (vertical) and 堀 (ditch/trench).
Variant using 縦 (vertical), which is more common in modern Japanese but less specific to fortifications.
Compound of 竪 (たて, 'vertical') and 堀 (ほり, 'ditch, trench'). The reading ほり becomes ぼり due to rendaku.