noun

an area of wet muddy ground that is too soft to support a heavy body.

a peat bog

marsh,marshland,swamp,swampland,sump,mire,quagmire,quag,morass,slough,fen,fenland,wetland,carr,salt marsh,saltings,salina,bayou,moor,moss

verb

be or become stuck in mud or wet ground.

the car became bogged down on the beach road