shaft

(eg. essay, sign, metaphor )

shaft /ˈʃæft/ ?

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(n) a line that forms the length of an arrow pointer
(n) an aggressive remark directed at a person like a missile and intended to have a telling effect
(n) a long rod or pole (especially the handle of an implement or the body of a weapon like a spear or arrow)
(n) a column of light (as from a beacon)
(n) the main (mid) section of a long bone
(n) obscene terms for penis
(n) a long pointed rod used as a tool or weapon
(n) a vertical passageway through a building (as for an elevator)
(n) (architecture) upright consisting of the vertical part of a column
(n) a long vertical passage sunk into the earth, as for a mine or tunnel
(n) a revolving rod that transmits power or motion
(n) the hollow spine of a feather
(v) equip with a shaft
(v) defeat someone through trickery or deceit

Conventional oil drilling is vertical: drill ers bore a narrow shaft down through the layer of sedimentary rock in which the oil is stored.
After a very tight crawl into a long, narrow passage, we reached the brink of a shaft in the roof of the cave, then climbed down.
The proposal to sink a deep shaft ten or twelve miles into the crust of the earth is not new.