Source : Webster's Revised Unabridged Dictionary (1913)

Submerge \Sub*merge"\, v. t. [imp. & p. p. {Submerged}; p. pr. &
   vb. n. {Submerging}.] [L. submergere, submersum; sub under +
   mergere to plunge: cf. F. submerger. See {Merge}.]
   1. To put under water; to plunge.

   2. To cover or overflow with water; to inundate; to flood; to
      drown.

            I would thou didst, So half my Egypt were submerged.
                                                  --Shak.

Source : WordNet®

submerged
     adj 1: under water; e.g. at the bottom of a body of water; "sunken
            treasure"; "a sunken ship" [syn: {sunken}] [ant: {afloat(p)},
             {aground(p)}]
     2: beneath the surface of the water; "submerged rocks" [syn: {submersed},
         {underwater}]
     3: growing or remaining under water; "viewing subaqueous fauna
        from a glass-bottomed boat"; "submerged leaves" [syn: {subaqueous},
         {subaquatic}, {submersed}, {underwater}]