Customary law : প্রথাসিদ্ধ আইন;
Related Words
customarily  customary law  See Words Also In
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Appropriate Prepositions
Agree with, on, to(একমত হওয়া): My father agreed with me on this point, but he did not agree to my proposal to set up a canteen.
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Look up (ডিকশনারি থেকে শব্দার্থ খোঁজা): He is looking up a new word meaning from dictionary.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Slow coach (অলস): You cannot expect much from a slow coach.
Take into account (বিবেচনা করা): Your activities should be taken into account.