retreating

Retreat \Re*treat"\, v. i. [imp. & p. p. {Retreated}; p. pr. &
   vb. n. {Retreating}.]
   To make a retreat; to retire from any position or place; to
   withdraw; as, the defeated army retreated from the field.
   [1913 Webster]

         The rapid currents drive
         Towards the retreating sea their furious tide.
                                                  --Milton.
   [1913 Webster]
    

45 Moby Thesaurus words for "retreating":
      boat-shaped, boatlike, bowl-shaped, bowllike, cavelike, cavernous,
      concave, concaved, craterlike, cup-shaped, cupped, cymbiform,
      declining, diminishing, dish-shaped, dished, dishing, dishlike,
      dwindling, dying, ebbing, fading, funnel-breasted, funnel-chested,
      funnel-shaped, hollow, hollowed, incurved, incurving, incurvous,
      infundibular, infundibuliform, navicular, naviform, receding,
      retiring, saucer-shaped, scaphoid, scyphate, shrinking, sinking,
      spoonlike, sunk, sunken, waning