Definition of "Exhaust" :
noun: system consisting of the parts of an engine through which burned gases or steam are discharged
noun: gases ejected from an engine as waste products
verb: wear out completely
"This kind of work exhausts me."
verb: eliminate (a substance)
"Combustion products are exhausted in the engine."
verb: use up the whole supply of
"We have exhausted the food supplies."
verb: use up (resources or materials)
"We exhausted our savings."
"Exhaust one's savings."