Strengthen : সরল করা;
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strengthen  strengthened  strengthening  strengthens  See Words Also In
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Appropriate Prepositions
Arrive at(উপস্থিত হওয়া, পৌছানো): The train arrived at Dhaka station on time.
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Remedy for (প্রতিকার): There is no remedy for cancer.
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Idioms
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
Call in question (সন্দেহ করা): No one can call his honesty in question.
Lame excuse (বাজে ওজর): The lame excuse will not do.
Pack up a quarrel (ঝগড়া মিটানো)— He packed up their quarrel.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.