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) A pledge is a solemn promise, a security, or a token of something. Learn the different meanings and uses of pledge in various contexts, such as law, finance, social welfare, and idioms. Learn the various meanings and uses of the word pledge as a noun and a verb, with synonyms, examples, and pronunciation. Find out how to pledge something, someone, or yourself in different contexts and situations. pledge definition : commit by a solemn promise. Check meanings, examples, usage tips, pronunciation, domains, and related words. Discover expressions like " pledge allegiance to", " pledge someone to secrecy", "take the pledge ".