Fountain-head : উত্সমুখ; আদি; আদি উত্স; সূত্রপাত;
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Appropriate Prepositions
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Attention to(মনোযোগ): He has no attention to his studies.
Conscious of(সচেতন): I am conscious of my deficiencies.
Desire for (কামনা): He has no desire for fame.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
Lame excuse (বাজে ওজর): The lame excuse will not do.
Slow coach (অলস): You cannot expect much from a slow coach.