Cloak and dagger : ষড়যন্ত্রের ও গুপ্তচরবৃত্তির নীতি;
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Appropriate Prepositions
Acceptable to(গ্রহণযোগ্য): Such behavior is just not acceptable in this school.
Ashamed of(লজ্জিত): Nandini was ashamed of his wrong-doing.
Congenial to(উপযোগী): The atmosphere is congenial to your health.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Devoted to (মনোযোগী): He is devoted to music.
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Idioms
Cut to the quick (মর্মাহত হওয়া): I was cut to the quick by his birds.
Follow the footsteps of (পায়ে পায়ে অনুসরণ করা): People always follow the footsteps of some great man.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.