plummet
noun
a piece of lead or some other weight attached to a line, used for determining perpendicularity, for sounding, etc.; the bob of a plumb line.
Used to describe an action that will be fully completed or achieved by a specific point in the future.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
However, it seems almost certain that the Redskins will have to try to trade Haynesworth in the offseason, although his trade value will have plummeted because other teams know Shanahan won't want him back.
From New York Times ● Dec. 8, 2010