Plano concave : সমাবতল;
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plano concave  plano-concave  See Words Also In
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Appropriate Prepositions
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Delighted at/with (আনন্দিত হওয়া): Sharmin was delighted at/with her husband’s promotion.
Full of (পরিপূর্ণ): Our Rivers are full of fishes.
Heir of (উত্তরাধিকারী): He is the heir of his father.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
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Idioms
Hold water (ধোপে টেকা): This policy will not hold water in this situation.
Lump sum (এক কালীন) — He gave us lump sum money.
Soft Soap (নিজ অভিপ্রায়ে/অভিসন্ধিতে তোষামোদ করা): He was expert in soft soap.
To the brim (কানায় কানায়) - The river was full to the brim.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.