Fly-by-night : বিমানপোতের নৈশধাবন;
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fly-by-night  flybynight  See Words Also In
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Appropriate Prepositions
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Charge with(অভিযুক্ত করা): He is charged with killing.
Quick at (চটপটে): A cashier must be quick at figures.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
Work with (কারো সাথে কাজ করা): They will be working with me on the new project.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Null and void (বাতিল): The deed has been null and void now.
Set free (মুক্ত করা): The prisoners were set free.
Up to (পর্যন্ত) - I have done the exercises up to page 40.