Black marketing : অপপণন; চোরা কারবার;
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Appropriate Prepositions
Adept in (দক্ষ): He is adept in playing football.
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Convenient to(সুবিধাজনক): The work is convenient to your nature.
Match for (প্রতিদ্বন্দ্বী): He is no match for me.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
Under age (অপ্রাপ্ত বয়স্ক)- He could not cast his vote because he was under age.