plumb the depths idiom
跌入最低点，陷入低谷
to reach the lowest point
Roy plumbed the depths of despair when his wife left him. 妻子离开他之后，罗伊陷入了绝望的深渊。
humorous They must be really plumbing the depths (= must have been unable to find anyone better) if they're offering the job to her. 如果他们要把这个工作机会给她，说明他们实在是没有更好的人选了。