Pronunciation IPA (key): /ɪgˈzɔst/ Audio (US)(file) Plain form exhaust Third-person singular exhausts Past tense exhausted Past participle exhausted Present participle exhausting To use up completely. So many people came to dinner that we had exhausted the supply of silverware. I had to use my fingers. To empty by using. The well was exhausted. To wear out; use up one's strength, patience, or resources. You look exhausted, have you had any sleep? To completely develop or discuss some topic or idea. We exhausted our money saving topic, there was nothing else to talk about on it. Synonyms consume spend tire out weary Related words exhaustion Singular exhaust Plural exhausts Exhaust pipe The part of an engine or motor where burned gases or steam comes out. A pipe or vent used to take bad air out of a room or closed space. Related words and phrases exhaust fan exhaustless exhaust nozzle exhaust pipe exhaust port exhaust purifier exhaust steam exhaust system exhaust valve