Biquadratic : চতুর্ঘাত;
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Appropriate Prepositions
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Bare of(অনাবৃত, স্বল্প-সজ্জা): The trees of the forest are bare of leaves.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Long for (আশা করা/কামনা করা): He longed for name and fame.
Make from (কোনো উপকরণ দ্বারা সরাসরি তৈরী নয় বোঝাতে): Paper is made from bamboo.
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Idioms
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Gift of the gab (বাকপটুতা): An advocate should have the gift of the gab.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.