Definition & Meaning of "squib"in English

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

"Squib" is a slang term used to describe a person regarded as insignificant, weak, or ineffective. It comes from the small, weak firework called a squib, which produces a brief, unimpressive spark rather than a strong explosion. The term entered English usage in the 18th–19th centuries, originally for literal fireworks and later metaphorically for people or efforts that fail to make an impact. It is mildly derogatory, used in informal, literary, or humorous contexts to criticize someone's abilities or presence, and is rarely deeply offensive.