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From The Collaborative International Dictionary of English v.0.48:
Neap \Neap\ (n[=e]p), a. [As. n[=e]pfl[=o]d neap flood; cf. hnipian to bend, incline.] Low. [1913 Webster] Neap tides, the lowest tides of the lunar month, which occur in the second and fourth quarters of the moon; -- opposed to spring tides. [1913 Webster]