Impromptu : উপস্থিতমত; বিনা প্রস্তুতিতে; পূর্বপ্রস্তুতি ব্যতীত; তাৎক্ষণিক; চটজলদি; প্রত্যুৎপন্ন;
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Appropriate Prepositions
By heart (মুখস্থ): Kamal learnt to poem by heart.
Call in(ডাকিয়া আনা): They called in a doctor.
Conceal from(লুকানো) Do not conceal anything from me.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.