back in rightglossary / BACK-IN RIGHT back-in right. Oil & gas. A reversionary interest in an oil-and-gas lease entitling an assignor to a share of the working interest after the assignee has recovered specified costs from production. 词条贡献者 双语律师郭敏,国际知名商学院金融专业,擅长翻译各类与金融衍生品与结构化产品相关的法律文件。