infighting \ˈ ̷ ̷ˌ ̷ ̷ ̷ ̷\noun (-s) Etymology:in (IV) + fighting 1. a.: fighting or boxing at close range < his bowie … was the unexcelled weapon for infighting — American Guide Series: Arkansas > b.: fighting (as between rivals) that is not openly acknowledged or conducted 2.: fighting without rules : rough-and-tumble fighting