Raison d’etre : কোনও জিনিসের অস্তিত্বের কারণ;
Related Words
raison dêtre  raison d’etre  See Words Also In
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Appropriate Prepositions
Attest to(প্রত্যয়ন করা): I like to attest to your ability.
Behave towards(ব্যবহার করা): The students behaved objectionably towards the Head teacher.
Dwell in (বাস করা): He dwells in a tall apartment.
Satisfied with (সন্তুষ্ট): The authoress was highly satisfied with Jerry.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Slip of the tongue (বলায় সামান্য ভুল): This is a slip of the tongue; don’t pay much stress on it.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.