exhaustexhaustexhaustsexhaustedexhausting2verb (exhausts, exhausting, exhausted)to make you feel very tired: The long journey exhausted us.▶ exhaustedadjective: I'm exhausted – I think I'll go to bed.exhaustexhaust1noun1(no plural) the waste gas that comes out of a vehicle, an engine or a machine: car exhaust fumes2(alsoexhaust pipe) (British) (Americantailpipe)a pipe through which waste gases come out, for example on a car