say it: shaft
shaft is a noun and verb meaning "a line that forms the length of an arrow pointer". It carries 14 recorded senses.
a column of light (as from a beacon)
a vertical passageway through a building (as for an elevator)
a revolving rod that transmits power or motion
equip with a shaft
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for shaft come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.