Cloak and dagger : ষড়যন্ত্রের ও গুপ্তচরবৃত্তির নীতি;
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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.
Bar to(বাধা): Poverty is not a bar to happiness.
Comply with(মেনে নেওয়া): The clerks must comply with the orders of their officer.
Independent of (স্বাধীন): They are independent of my health.
Loyal to (অনুগত): Every citizen must be loyal to the state.
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Idioms
Lump sum (এক কালীন) — He gave us lump sum money.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
Run high (বেড়ে যাওয়া) —The price of everything has run high.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
Through thick and thin (through all difficulties, সমস্ত সমস্যার মধ্যে)-Ruma followed her husband through thick and thin.