Obsidian : কাচের মতো দেখতে একজাতীয় আগ্নেয়শিলা;
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Appropriate Prepositions
Adjacent to (সন্নিহিত): His house was adjacent to the bridge.
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Drop to (নিচে নামানো): Asif dropped his voice to a whisper.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Lost in (মগ্ন): Simon is lost in meditation.
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Idioms
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
Call in question (সন্দেহ করা): No one can call his honesty in question.
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.