Firstly : প্রথমত;
Related Words
firstling  firstly  forestall  See Words Also In
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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.
Certain of(নিশ্চিত): Jamal is certain of his success.
Desire for (কামনা): He has no desire for fame.
Detrimental to (অপকারী): Smoking is detrimental to health.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
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Idioms
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
In full swing (পুরোদমে): The school is in full swing after the vacation.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.