|Origin:||exhaustus, past participle of exhaurire, from haurire 'to draw off liquid, drain'|
to make someone feel extremely tired:
A full day's teaching exhausts me.
He'd exhausted himself carrying all the boxes upstairs.
to use all of something [= 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.
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.