Keyhole : চাবির ছিদ্র; তালার নাই; তালাতে চাবি ঘোরানোর গর্ত;
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Appropriate Prepositions
Adjacent to(সংলগ্ন): The Post Office is adjacent to my house.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Indifferent to (উদাসীন): Everybody is indifferent to my problem.
Infested with (অতিষ্ঠ): The room is infested with rats.
Rely on (নির্ভর করা): We should not rely on a lazy man.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
Sheet anchor (শেষ আশ্রয়; প্রধান অবলম্বন; আসল খুঁটি)— This small piece of land is his sheet anchor.
Without fail (অবশ্যই) - You must attend the meeting without fail.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.