◆root and branch
CONCISE OXFORD's difinition
［IDM] (of a process or operation) thorough or radical
COBUILD's difinition
⑪If something has been completely changed or destroyed, you can say that has been changed or destroyed root and branch. [written] (ex.)The forces of National Socialism were transforming Germany root and branch.../Some prison practices are in need of root and branch reform.
British Prime Minister Gordon Brown threatened a root and branch review of relations between the European Union and the Kremlin.
ゴードン･ブラウン英首相は、欧州連合（EU）とクレムリン（ロシア政府）の関係を全面的に見直すと警告した。
◆root and branch ： 完全に、徹底的に、全面的に