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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.
Best Answer: Nearly everybody knows the tides are caused by the gravitational attraction between the earth and the moon (and to a lesser extent; between the earth and the sun); but nearly everybody gets it wrong HOW the attraction causes the tides; and especially why the tides are highest at full and new moon.