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Jessie,在一家亚洲一流律师事务所的北京办公室担任全职法律翻译,擅长翻译有关港口、铁路、公路与海运的法律文件。