quagEnglishOxford Dictionary of Englishquag /kwaɡ , kwɒɡ / ▸ noun archaic a marshy or boggy place. – DERIVATIVES quaggy /ˈkwaɡi , ˈkwɒɡi / adjective– ORIGIN late 16th century: related to dialect quag ‘shake, quiver’; probably symbolic, the qu- suggesting movement (as in quake and quick).