Definition of "ebb and flow" []

• The flowing out and in of the tide. (noun)
• A large flowing out and in. (noun)
• To alternately ebb and flow. (verb)

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• "As soon as the Crusaders were assured of the town, the basilica which already in the ebb and flow of the Crusades had undergone several similar transmutations was repurified and rededicated to the Virgin; and the King and army, entering in procession barefoot, heard Mass, and took possession of the place."
• "Since that time, a handful of devoted biogeographers have visited intermittently, paying careful attention to the ebb and flow of species."
• "Maybe that worked, or maybe it was just the predictable ebb and flow between two evenly matched players, but with a bogey I won the par-three tentha strange hole with a sort of low levee running diagonally through itand the twelfth with another bogey, then the fifteenth and sixteenth with pars."