nadirKK [ˈnedɚ] ｜ /ˈneɪdɚ/
GEPT 中高級
C2noun
the lowest point that a celestial body can reach in the sky as perceived by the observer on earth
When stargazing late at night, I saw the moon sinking to its nadir, disappearing below the horizon.
天底；最低點（天文）
C2noun
an extreme or lowest point of something, especially in terms of morality or prosperity
The nadir of his career came when he was caught stealing from his own company.
最低谷；最低點