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Noun [edit]. neap tide â(plural neap tides). 1  The tide which occurs just after the first and third quarters of the moon, when there is least difference between high tide and low tide. 2  Spring tides occur when the Sun and Moon line up, since the gravities of the two bodies add together to create larger tidal forces.
They occur because of the difference in gravitational effect on one side of an object (like Earth) compared to the other. Here's how they work (full explanation of tides): The ocean on the side of Earth facing the moon gets pulled toward the moon more than does the center of the planet. This creates a high tide.