I. ex ‧ haust 1 /ɪɡˈzɔːst $ -ˈzɒːst/ BrE AmE verb [transitive]
[ Date: 1500-1600 ; Language: Latin ; Origin: exhaustus , past participle of exhaurire , from haurire 'to draw off liquid, drain' ]
1 . to make someone feel extremely tired:
A full day’s teaching exhausts me.
He’d exhausted himself carrying all the boxes upstairs.
2 . to use all of something SYN use up :
We are in danger of exhausting the world’s oil supply.
Having exhausted all other possibilities, I asked Jan to look after the baby.
3 . exhaust a subject/topic etc to talk about something so much that you have nothing more to say about it:
Once we’d exhausted the subject of Jill’s wedding, I didn’t know what to say.
II. exhaust 2 BrE AmE noun
1 . ( also exhaust pipe ) [countable] a pipe on a car or machine that waste gases pass through
2 . [uncountable] the gas produced when an engine is working: