Source : WordNet®

pass away
     v 1: pass from physical life and lose all all bodily attributes
          and functions necessary to sustain life; "She died from
          cancer"; "They children perished in the fire"; "The
          patient went peacefully" [syn: {die}, {decease}, {perish},
           {go}, {exit}, {expire}, {pass}] [ant: {be born}]
     2: go out of existence; "She hoped that the problem would
        eventually pass away"