The
Meaning of "Leech"
http://www.bio.purdue.edu/courses/leechnews/leech.html
In this
poem the word leech is used in the line "From those who leech on other
people's lives." The word leech is not really used as the bug who lives
on blood but, on people lives and money. An example of it is somebody who
lives in somebody's house for free or if they borrow money and don't give
it back.
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to the main poem.