The nadir of something is the lowest, worst point it reaches — the moment when a situation seems as bad as it can get. A team can hit the nadir of a season; a country can reach the nadir of a crisis. After that, people hope the line starts to climb.

The nadir of something is the lowest, worst point it reaches某件事的nadir，是它所到達最低、最糟的那個點— the moment when a situation seems as bad as it can get也就是情況看起來已經糟到不能再糟的那一刻。A team can hit the nadir of a season一支隊伍可以在某個賽季碰到它的nadir；a country can reach the nadir of a crisis一個國家也可以在某場危機中觸底。After that在那之後，people hope the line starts to climb大家會希望情勢開始回升。

The word feels formal and a little bookish; in easy talk you would more often say the lowest point, or rock bottom.

The word feels formal and a little bookish這個字聽起來正式、有點書面；in easy talk you would more often say the lowest point, or rock bottom平常說話比較常說the lowest point或rock bottom。

It began as a sky word. In old astronomy the nadir is the point in the sky right under your feet, opposite the zenith, the point right above your head. English then stretched that picture to luck, history, and feeling.

It began as a sky word它最早是一個天文用語。In old astronomy在古代天文學裡，the nadir is the point in the sky right under your feetnadir指的是天空中正好在你腳底下方那個點，opposite the zenith跟zenith（天頂）相對，the point right above your head也就是正好在你頭頂上方的那個點。English then stretched that picture後來英文把這個畫面延伸to luck, history, and feeling用到了運勢、歷史和心情上。

You almost always say the nadir of something, not just nadir on its own.

You almost always say the nadir of something你幾乎都會說the nadir of something，not just nadir on its own而不是單獨只說nadir。