Once in a blue moon : নমাসে ছমাসে;
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Appropriate Prepositions
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Certain of(নিশ্চিত): Jamal is certain of his success.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Innocent of (নির্দোষ): The maid servant was proved innocent of the alleged theft.
Yield to (নতি স্বীকার করা): I shall not yield to his temptation.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
In vogue (চালু): This custom is not in vogue at present.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.
Yellow dog (হীন ব্যক্তি) - A yellow dog is always hated by all.