Definition & Meaning of "bloodsucker"in English

What is the origin of the term "bloodsucker" and how is it used?

"Bloodsucker" is an English term that dates back to at least the 17th century, originally referring literally to creatures like leeches or mosquitoes that feed on blood. By the 19th century, it was used metaphorically for people who exploit others, especially financially or socially, likening them to parasites that drain their victims. The term is widely used in informal speech, journalism, and literature to condemn greedy, parasitic, or exploitative behavior. It is derogatory, expressing strong disapproval, but is not vulgar.