the lowest point in the fortunes of a person or organization 最低点;最不幸的时刻 the 1420s marked the nadir of French for- tunes. 15世纪20年代是法国最不幸的时期。 ■(Astronomy)the point on the celestial sphere directly below an observer (天文)天底。 zenith. 的反义词
语源
late Middle English (in the astronomical sense): via French from Arabic naẓīr (as-samt) 'opposite (to the zenith')