We needroot and branchreform of rape laws of our country. Here the underlined phrase means:

• Root and branch:
English Meaning: used to express the thorough or radical nature of a process or operation / completely.
Bangla Meaning: সমূল / আমূল / সম্পূর্ণরূপে।

Ex. Sentence: We need root and branch reform of rape laws of our country.
Bangla Meaning: আমাদের দেশের ধর্ষণ আইনের আমূল পরিবর্তন প্রয়োজন।

Source: Website Lecture.