Definition of tidal wave noun from the Oxford Advanced American Dictionary

     

    tidal wave

     noun
    noun
     
     
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  1. 1a very large ocean wave that is caused by a storm or an earthquake, and that destroys things when it reaches the land
  2. 2tidal wave (of something) a sudden increase in a particular feeling, activity, or type of behavior a tidal wave of crime
See the Oxford Advanced Learner's Dictionary entry: tidal wave