In principle : মূল নীতি বা নিয়ম দিক দিয়া;
Related Words
in principle  infrangible  inprinciple  See Words Also In
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Appropriate Prepositions
Admit to(ভর্তি করা): The boy was admitted to class Nine.
Assure of(আশ্বাস দেওয়া): I can assure you of the Principal’s honesty.
Consolidate for (শক্তিশালী করা): The four new companies consolidated for greater efficiency.
Covetous of(লোভী হওয়া): He is covetous of wealth.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Pick a quarrel (ঝগড়া করা)—Do not pick a quarrel.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.
White color job – (উচ্চ শ্রেনীর চাকরি, যেখানে শারীরিক কাজ নেই বললেই চলে- a job without manual labour) - He wants a white color job.