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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.
Two high tides occur each day, due to the gravitational pull on the  ocean generated by the moon. There are also two low tides in every  24-hour period.