Concavo-convex : এক পার্শ্বে অবতল অন্য পার্শ্বে উত্তল;
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Appropriate Prepositions
Zeal for (উৎসাহ): Forhad has great zeal for cricket.
Die of (রোগে মরা): Many people died of cholera.
Dressed in (সজ্জিত, পরিহিত): The girl was dressed in silk.
Dwell in (বাস করা): He dwells in a tall apartment.
Yield to (নতি স্বীকার করা): I shall not yield to his temptation.
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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.
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
Lame excuse (বাজে ওজর): The lame excuse will not do.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.