Biquadratic : চতুর্ঘাত;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Cause for (চিন্তিত হওয়ার কারণ): He has never given me any cause for concern.
Conscious of(সচেতন): I am conscious of my deficiencies.
Control over(নিয়ন্ত্রণ): He has no control over his sons.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
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Idioms
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.