Grey cells : ঘিলু; মগজ; বুদ্ধি;
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graceless  grey cells  See Words Also In
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Appropriate Prepositions
Arrive at(উপস্থিত হওয়া, পৌছানো): The train arrived at Dhaka station on time.
Caution against(সাবধান): Take all cautions against the danger.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
Destitute of (নিঃস্ব; বিবর্জিত): He is destitute of any friend here.
Repent of (অনুতাপ করা): I repented of my past.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Cut to the quick (মর্মাহত হওয়া): I was cut to the quick by his birds.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Null and void (বাতিল): The deed has been null and void now.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.