In principle : মূল নীতি বা নিয়ম দিক দিয়া;
Related Words
in principle  infrangible  inprinciple  See Words Also In
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Appropriate Prepositions
Abound with(ছেয়ে থাকা): They live in a region that abounds with oil.
Apply for(কারো কাছে আবেদন করা): Sumi applied to the Principal for free studentship.
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
With a view to (উদ্দেশ্য): I went to hospital with a view to seeing you.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
In no time (শীঘ্র): He will finish the work in no time.
Run high (বেড়ে যাওয়া) —The price of everything has run high.