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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.
A neap tide occurs when the tidal forces of the Sun and the Moon work at right angles to each other, lessening the total effect of the tides. This happens when the Sun, Moon and Earth form a triangle pattern. This happens at the first or third quarter phases of the Moon. 40 people found this useful.