tidal wave
Pronunciation:
/ˈtaɪdəlweɪv/noun
Definitions
A large and sudden rise and fall in the tide.
A large, sudden, and disastrous wave of water caused by a tremendous disturbance in the ocean; a tsunami. (See Usage notes below.)
Example: The last tidal wave here killed twenty and left thousands homeless.
A large, sudden inundation of water from the storm surge, or waves of that surge.
A sudden and powerful surge.
Example: As the doors opened, a tidal wave of people flooded into the room.