Perfidy : বিশ্বাস-ঘাতকতা;
Related Words
perfidious  perfidy  profit  profited  purified  See Words Also In
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Appropriate Prepositions
Acceptable to(গ্রহণযোগ্য): Such behavior is just not acceptable in this school.
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Appropriate to(যোগ্য): His answer is appropriate to the question.
Conceal from(লুকানো) Do not conceal anything from me.
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
At a discount (অনাদৃত) Female education is no longer at a discount now.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.