- The definition of a quag is a shortened version of quagmire, with means a bog or wet area covered in rotting plants.
An example of a quag is a marsh in the English countryside.
A quag in Dartmoor.Licensed from iStockPhoto
Origin: from uncertain or unknown; perhaps
Used by arrangement with John Wiley & Sons, Inc.
Origin: Perhaps variant of Middle English quabbe, from Old English *cwabba.