Keyhole : চাবির ছিদ্র; তালার নাই; তালাতে চাবি ঘোরানোর গর্ত;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Heir of (উত্তরাধিকারী): He is the heir of his father.
Run on (বিরতিহীন চলা): The bus is running on time.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
Call in question (সন্দেহ করা): No one can call his honesty in question.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.
Sheet anchor (শেষ আশ্রয়; প্রধান অবলম্বন; আসল খুঁটি)— This small piece of land is his sheet anchor.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.