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 译者亚明,毕业于国内一流的高级翻译学院,擅长翻译各种与网络安全、隐私和数据保护相关的法律文件。