tidal wave

WordReference Random House Learner's Dictionary of American English © 2026

ˈtid•al ˌwave, n. [countable]

1. Oceanography (not in technical use) a large, destructive ocean wave, produced by a seaquake, hurricane, or strong wind. Compare tsunami.
2. any powerful or widespread opinion, etc.:
   His plan to tax the middle class raised a tidal wave of protest.

WordReference Random House Unabridged Dictionary of American English © 2026

tid′al wave′, 

1. Oceanography (not in technical use) a large, destructive ocean wave, produced by a seaquake, hurricane, or strong wind. Cf. tsunami. 
2. Oceanography either of the two great wavelike swellings of the ocean surface that move around the earth on opposite sides and give rise to tide, caused by the attraction of the moon and sun.
3. any widespread or powerful movement, opinion, or tendency:
   a tidal wave of public indignation.
• 1820–30

Collins Concise English Dictionary © HarperCollins Publishers::

tidal wave noun

1. a name (not accepted in technical usage) for tsunami
2. an unusually large incoming wave, often caused by high winds and spring tides
3. a forceful and widespread movement in public opinion, action, etc