dropshaft means A vertical shaft which objects can drop through. Lexicurio rates it Sui generis — a strength score of 100 out of 100.
Etymology
Compound of drop + shaft.
noun
- A vertical shaft which objects can drop through.“Melas said that district engineers had located Deep Tunnel dropshafts that were near a portion of the freight tunnels and that they would drill, cut or blast through to the flooded areas "as soon as possible."”