Added 9 October 2026 backrush noun Categories: Obscure Words noun ! Definition from Wiktionary (CC BY-SA). More about backrush at Wordnik → Where our words come from → A rushing backward; a retreat. Origin From back- + rush. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: backwashbackpressurebackflowbackflushinginrushbackoffbackspinonrushoutrushbackwashingbackload Back to today's word