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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.
Low tide and high tide occur as a result of the combined gravitational pulls of the Sun and the Moon, and the rotation of the Earth. The moon's gravity pulls on the ocean wat â¦ er so that there are bulges in the ocean on both sides of the planet (directly under the moon and on the opposite side of Earth).