Meaning of “exhaust” - Learner’s Dictionary

exhaust

noun uk us /ɪɡˈzɔːst/
GAS [ U ]

the waste gas from a vehicle's engine:

exhaust fumes
PIPE [ C ] (also exhaust pipe) mainly UK

the pipe that waste gas from a vehicle's engine flows through

(Definition of “exhaust noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)