rock bottom noun
Learner's definition of ROCK BOTTOM
[noncount]
: the lowest possible level or point最低水平；最低点 -
Prices have hit/reached rock bottom. [=have reached the lowest point they can reach]价格已经降至最低点。
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After years of heavy drug use, she has finally reached rock bottom.多年大量吸食毒品后，她终于倒下了。
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Their marriage has hit rock bottom.他们的婚姻已难以为继。