Police officer : পুলিশ অফিসার; থানাদার; থানা-সংক্রান্ত কর্মচারী;
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Appropriate Prepositions
Apart from(ছাড়া, ব্যতীত, দূরে): They pave apart from each other.
Convinced of (আশ্বস্ত): You are convinced of his product.
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
Die of (রোগে মরা): Many people died of cholera.
Quarrel over (কোন বিষয়ে ঝগড়া করা): Do not quarrel over this trifling matter, let it be drop.
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Idioms
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
On the wane (হ্রাসমান): His fame is on the wane now.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.