plumb
noun
a small mass of lead or other heavy material, as that suspended by a line and used to measure the depth of water or to ascertain a vertical line.
had been plumbing
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past perfect progressiveof plumb.past perfect progressive
Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The court’s decision may ultimately force her to compromise, a prospect that led the pound to rise Thursday morning, lifting it from the multidecade lows it had been plumbing in recent weeks.
From New York Times ● Nov. 3, 2016
