Unfaithfulness : অন্যাসক্তি; আনুগত্যহীনতা; বিশ্বাসঘাতকতা; ব্যভিচারিতা;
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Appropriate Prepositions
Adhere to (লেগে থাকা, অটল থাকা): You should adhere to your principal.
Anxious for (কারোর ব্যাপারে চিন্তিত): Sabbir was anxious for her.
Congratulate on(অভিনন্দন জানানো): They congratulated me on my brilliant success.
Make from (কোনো উপকরণ দ্বারা সরাসরি তৈরী নয় বোঝাতে): Paper is made from bamboo.
Yield to (নতি স্বীকার করা): I shall not yield to his temptation.
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Idioms
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.
Upper hand (প্রাধান্য) - He got the upper hand in the selection.