Master-key : চাবি দিয়া বহু রকমের তালা খোলা যায়,
Related Words
master key  master-key  masters  masterstroke  monasteries  mysteries  See Words Also In
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Appropriate Prepositions
Attest to(প্রত্যয়ন করা): I like to attest to your ability.
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Rid of (মুক্তি দেওয়া): He will get rid of troubles soon.
Substitute for (বদলে দেওয়া): This action is substitute for that.
Urge upon (আহবান জানানো): She urged upon his son the importance of being honest.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
Lame excuse (বাজে ওজর): The lame excuse will not do.
Short cut (সংক্ষিপ্ত পথ)— He comes by this shortcut.