cop a pleaglossary / COP A PLEA cop a plea, vb. Slang. (Of a criminal defendant) to plead guilty to a lesser charge as a means to avoid standing trial for a more serious offense. See PLEA BARGAIN. 词条贡献者 双语律师李明,国际知名法学院法律专业,擅长翻译各类与政府监管相关的法律文件。