Oxford Dictionary English

    tidal wave

    noun
    noun
    BrE BrE//ˈtaɪdl weɪv//
    ; NAmE NAmE//ˈtaɪdl weɪv//
    Coastlines and the sea, Natural disasters
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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 According to one account, the explosion caused a tidal wave 65 feet high. See related entries: Coastlines and the sea, Natural disasters
  2. 2tidal wave (of something) a sudden increase in a particular feeling, activity or type of behaviour a tidal wave of crime See related entries: Coastlines and the sea
See tidal wave in the Oxford Advanced American Dictionary
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