Cloak and dagger : ষড়যন্ত্রের ও গুপ্তচরবৃত্তির নীতি;
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Appropriate Prepositions
Attentive to(মনোযোগী): He is attentive to his business.
Careless of(অসতর্ক): Do not be careless of your health.
Convinced of (আশ্বস্ত): You are convinced of his product.
Detrimental to (অপকারী): Smoking is detrimental to health.
Shocked at (মানসিক আঘাতপ্রাপ্ত): Snigdha was terribly shocked at the death of Ratul.
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Idioms
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Far and wide (সর্বত্র): His fame spread far and wide.
Give one’s right arm (বিপদের ঝুকি নেয়া): I will give my right arm if I could manage the tickets.
Pick one’s pocket (পকেট মারা)— He tried to pick my pocket.