low-water mark

Noun
  1. An extreme state of adversity;
    The lowest point of anything (synset 114510223)
    is a type of: adversity, hard knocks, hardship - a state of misfortune or affliction
    same as: nadir
  2. A line marking the lowest level reached (synset 108697007)
    is a type of: water line, watermark - a line marking the level reached by a body of water

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