rock bottom
noun [ U ] informal uk/ˌrɒk ˈbɒt.əm/ us/ˌrɑːk ˈbɑː.t̬əm/
(LOW)
最低点；最低水平
the lowest possible level
Confidence in the government is at rock bottom. 民众对政府的信任降到了谷底。
Prices have reached rock bottom. 物价跌到了最低点。
They were selling the goods at rock-bottom prices. 他们以最低价销售货物。
The president's approval ratings have hit rock bottom. 总统的支持率已跌至最低点。
(UNHAPPY)
（生活中的）最低点，最不愉快的时刻
the most unhappy that someone has ever been in their life
Dan had just left me and I was at rock bottom. 丹刚刚离我而去，我心情糟到了极点。
Alcoholics often have to reach/hit rock bottom before they can recognize that they have a problem. 酗酒者往往把生活搞得一塌糊涂后才会意识到自己存在问题。