opt inglossary / OPT IN opt in, vb. To choose to participate in (something) (when the choice of settling or not settling came, the Joneses opted in, hoping to avoid a lengthy trial). 词条贡献者 法律翻译Max,毕业于一所培养最顶级翻译人才的语言学院,擅长翻译有关电信和互联网领域的法律文件。