Ocean's ebb and flow (4)

I believe the answer is:

tide

(Other definitions for tide that I've seen before include "Something going in and out" , "One thing that waits for no man" , "Ebb and flow of the sea" , "''There is a ... in the affairs of men'' (Julius Caesar)" , "Sea's ebb and flow" .)

I've seen this clue in the USA Today.

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