Definition & Meaning of "slacker"in English

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

"Slacker" is a slang term used to describe a person who is lazy, unmotivated, or consistently avoids work. It comes from the verb "to slack," meaning to loosen or be negligent, and emerged in English in the late 18th to early 19th century, originally referring to laziness or neglect of duty. The term became especially popular in the 20th century, notably during World War I and II, to criticize those avoiding military or civic responsibilities. It is derogatory, used in social, workplace, or political contexts, and conveys clear disapproval of someone's effort or work ethic.