Under the aegis of : সমর্থনে বা রক্ষণাবেক্ষণে বা নিশ্চিত আশ্রয়ে;
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Appropriate Prepositions
Absorbed in(মগ্ন): I am absorbed in my study.
Affection for(স্নেহ): She has a great affection for the child.
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
Consent to(মত দেওয়া): The Prime Minister consented to the proposal.
Play at (খেলা): I do not play at cards.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
To the point (সঠিক) - The boy answered the question to the point.