Learn the meaning of pledge as a noun and a verb in English, with usage examples and related words. Find out how to use pledge in different contexts, such as promises, donations, collateral and law. Master the word " PLEDGE " in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource. PLEDGE meaning : 1. a serious or formal promise, especially one to give money or to be a friend, or something that…. Learn more. The word pledge comes from the Old French plege, meaning “guarantee” or “security,” which is derived from the Latin plebiscitum (a formal agreement). Originally, it referred to giving something as a guarantee for a debt, but over time, it came to mean any serious promise or commitment. Examples He made a pledge to donate to charity. (Noun)