Home › Words › R › rebreatherebreatherebreathe means to breathe in air that has been exhaled.Among words judged in Lexicurio's Arena, rebreathe ranks #16,734 of 42,752 for Qualifying.EtymologyFrom re- + breathe.verbTo breathe in air that has been exhaled.Definitions & examples from Wiktionary (CC BY-SA 3.0).