Undercover : গুপ্তচর; চোরাগোপ্তা; গোপন; গুপ্ত; গুপ্তচরবৃত্তিতে নিযুক্ত;
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Appropriate Prepositions
Abound with(ছেয়ে থাকা): They live in a region that abounds with oil.
Caution against(সাবধান): Take all cautions against the danger.
Concerned with(জড়িত): She was concerned with such things.
Full of (পরিপূর্ণ): Our Rivers are full of fishes.
Render into (অনুবাদ করা): Render the passage into Bengap.
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Idioms
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
Be all and end all (the ultimate out come- চরম পরিণতি—n) A loss of one million taka was the be all and end all of the projects.
Bear (a) grudge (bear hostility to— শত্রুতা বা বিদ্বেষ পোষন করা—V) We should not bear (a) grudge against our brethren.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.