quagEnglishOxford New American Dictionaryquag /kwaɡ, kwæɡ / ▸ noun archaic a marshy or boggy place. – DERIVATIVES quaggy /ˈkwaɡē, ˈkwæɡi / adjective– ORIGIN late 16th century : related to dialect quag ‘shake, quiver’; probably symbolic, the qu- suggesting movement (as in quake and quick).