Nigrescence : কৃষ্ণতা;
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Appropriate Prepositions
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Fit for (যোগ্য): Sabina is not yet fit for marriage.
Thirst for (তৃষ্ণা, আকাঙ্ক্ষা): A wise man has no thirst for wealth.
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Idioms
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
Slow coach (অলস): You cannot expect much from a slow coach.