Undercover : গুপ্তচর; চোরাগোপ্তা; গোপন; গুপ্ত; গুপ্তচরবৃত্তিতে নিযুক্ত;
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Breakdown of (বিস্তারিত): Here is statistical breakdown of data.
Heir of (উত্তরাধিকারী): He is the heir of his father.
Remind of (স্মরণ করিয়ে দেওয়া): He reminded me of his request to lend him some money.
Suffer from (অসুখে ভোগা, কষ্ট পাওয়া): He has been suffering from fever for last three days.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.
Slip of the tongue (বলায় সামান্য ভুল): This is a slip of the tongue; don’t pay much stress on it.