Under the aegis of : সমর্থনে বা রক্ষণাবেক্ষণে বা নিশ্চিত আশ্রয়ে;
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Appropriate Prepositions
Afraid of(ভীত): An honest man is not afraid of telling the truth.
Bare of(অনাবৃত, স্বল্প-সজ্জা): The trees of the forest are bare of leaves.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Senior to (বয়সে বড়): He is senior to me by two years.
Subject to (সাপেক্ষে): The man was appointed subject to the approval of the chairman.
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Idioms
All along - (সব সময়): I was present in the meeting all along.
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
Round the clock (সমস্ত দিন): He is working round the clock.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.