DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   tidal wave
       n 1: an overwhelming manifestation of some emotion or
            phenomenon; "a tidal wave of nausea"; "the flood of letters
            hit him with the force of a tidal wave"; "a tidal wave of
            crime"
       2: an unusual (and often destructive) rise of water along the
          seashore caused by a storm or a combination of wind and high
          tide
       3: a wave resulting from the periodic flow of the tides that is
          caused by the gravitational attraction of the moon and sun