Meaning

noun gases ejected from an engine as waste products

noun system consisting of the parts of an engine through which burned gases or steam are discharged

verb wear out completely

originEtymology tree Proto-Indo-European *h₁éǵʰ Proto-Indo-European *-s Proto-Indo-European *h₁éǵʰs Proto-Italic *eks Latin ex Latin ex- Proto-Indo-European *h₂ews- Proto-Indo-European *h₂ews-ye-tider. Proto-Italic *auzjō Latin hauriō Latin exhauriō Latin exhaustusder. English exhaust From Latin exhaustus, past participle of exhaurīre (“to draw out, drink up, empty, exhaust”), from ex (“out”) + haurīre…

Etymology from Wiktionary, CC BY-SA 3.0