Black-swan : অতি দুর্লভ বস্তু; একজাতীয় অস্ট্রেলীয় সোয়ান;
Related Words
balkan  black mailing  black-swan  blacken  blackened  blackens  blacking  blackmail  blackmail ing  blackmailing  blackness  See Words Also In
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Appropriate Prepositions
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
Rely on (নির্ভর করা): We should not rely on a lazy man.
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Idioms
At times (মাঝে মাঝে): He at times comes here.
Far and wide (সর্বত্র): His fame spread far and wide.
Short cut (সংক্ষিপ্ত পথ)— He comes by this shortcut.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.