Under lock and key : তালাবদ্ধ;
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Appropriate Prepositions
Adjacent to (সন্নিহিত): His house was adjacent to the bridge.
Compensate for(ক্ষতিপূরণ করা): I will compensate him for the loss.
Cope with(সামলানো বা পেরে উঠা): They cannot cope with the situation.
Cruise to (জয় লাভ করা): The Bangladesh team cruised to their fifth successive win this afternoon.
Entitled to (অধিকারী): He is entitled to a reward for honesty.
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Idioms
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Null and void (বাতিল): The deed has been null and void now.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.