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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.
Tides. 1  Tides occur because of the pull of gravity of the Moon and the Sun on the Earth's oceans. Because the Moon is closer to the Earth, it has the greatest effect on our tides. 2  Spring tides (often called 'king tides' by fishermen) occur at New Moon and Full Moon when the Sun, the Moon and the Earth are in line.