tidal wave

(noun) an overwhelming manifestation of some emotion or phenomenon. Synonyms: tidal wave. Examples: "A tidal wave of nausea." "The flood of letters hit him with the force of a tidal wave." "A tidal wave of crime."

(noun) an unusual (and often destructive) rise of water along the seashore caused by a storm or a combination of wind and high tide. Synonyms: tidal wave.

(noun) a wave resulting from the periodic flow of the tides that is caused by the gravitational attraction of the moon and sun. Synonyms: tidal wave.