outthunder \(ˈ) ̷ ̷| ̷ ̷ ̷ ̷\transitive verb Etymology:out- + thunder 1.: to outdo in thundering < in the storm he must outthunder the thunder — John Mason Brown > 2.: to make more noise than : overpower in sound < the main thought is outthundered by the overtones — J.P.Bishop >