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 法律翻译William,毕业于法国一流的高级翻译学院,擅长翻译有关农业和食品领域的法律文件。