leech
noun
any bloodsucking or carnivorous aquatic or terrestrial worm of the class Hirudinea, certain freshwater species of which were formerly much used in medicine for bloodletting.
Used to express actions, events, or states that have not yet occurred but are expected to happen.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The fill buries the headwater streams and serves as a toxic sieve of ground-up rock and dirt that will leech heavy metals into the ground water.
From Slate ● Nov. 30, 2012