Keen : ব্যগ্র; তীক্ষ্ন; ধারাল; সুক্ষণ; প্রগাঢ়
Related Words
keen  ken  knee  kneen  See Words Also In
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Cast aside (ছুঁড়ে ফেলা): As soon as they become rich they cast aside their poor friends.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Indulge in (আসক্ত): You should not indulge in social media.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
Put up with (সহ্য করা - tolerate): I could not put up with his behavior.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.