A reader sent this to me from her research on the United States Patent and Trademark Office website.
According to Merriam-Webster online dictionary, a “tidal wave” is:
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: a very high, large wave in the ocean that is often caused by strong winds or an earthquake
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: a very large amount of something
while “title” is:
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: the name given to something (such as a book, song, or movie) to identify or describe it
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: a published book
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: a word or name that describes a person’s job in a company or organization
so “title wave,” unless it is the name of a book, song, or movie (in which case it should be capitalized), is incorrect. The proper term in this case should be “tidal wave.”