Undercover : গুপ্তচর; চোরাগোপ্তা; গোপন; গুপ্ত; গুপ্তচরবৃত্তিতে নিযুক্ত;
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Appropriate Prepositions
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
Fit for (যোগ্য): Sabina is not yet fit for marriage.
Hostile to (বিরোধী বা বিরূপ ভাবাপন্ন): Nobody is hostile to you.
Refer to (সিদ্ধান্তের জন্য প্রেরণ করা): The matter was referred to the Chairman for a decision.
Senior to (বয়সে বড়): He is senior to me by two years.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Breathe one’s last (decease, die- শেষ নিঃশেষ ত্যাগ করা, মরে যাওয়া) The man breathed his last in his native village.
Brown study (day dream-দিবাস্বপ্ন -n) The woman is absorbed in a brown study.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.