Definition & Meaning of "blackguard"in English

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

"Blackguard" is an English term dating back to the 16th century, originally referring to the lowest-ranking servants in a royal or noble household, particularly those working in kitchens or stables, who were often considered dirty or disreputable. Over time, the word took on a figurative meaning, coming to describe a person who is dishonest, unscrupulous, or villainous. It has been used in literature, historical texts, and everyday speech in Britain and beyond. The term is derogatory but somewhat old-fashioned today, carrying strong disapproval without being overtly vulgar.