Source : WordNet®

come upon
     v 1: find unexpectedly; "the archeologists chanced upon an old
          tomb"; "she struck a goldmine"; "The hikers finally
          struck the main path to the lake" [syn: {fall upon}, {strike},
           {light upon}, {chance upon}, {come across}, {chance on},
           {happen upon}, {attain}, {discover}]
     2: take possession of; "She entered upon the estate of her rich
        relatives" [syn: {enter upon}, {luck into}]