Source : Webster's Revised Unabridged Dictionary (1913)

Aground \A*ground"\, adv. & a. [Pref. a- + ground.]
   On the ground; stranded; -- a nautical term applied to a ship
   when its bottom lodges on the ground. --Totten.

Source : WordNet®

aground
     adj : on a shore or reef; "a ship aground offshore"; "a boat
           aground on the beach waiting for the tide to lift it"
           [syn: {aground(p)}] [ant: {sunken}, {afloat(p)}]
     adv : with the bottom lodged on the ground; "he ran the ship
           aground"