Water tight : জলাভেদ্য; জলরোধক;
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Appropriate Prepositions
Aware of(অবগত): I am not aware of his dishonesty.
Compensate for(ক্ষতিপূরণ করা): I will compensate him for the loss.
Entitled to (অধিকারী): He is entitled to a reward for honesty.
Make from (কোনো উপকরণ দ্বারা সরাসরি তৈরী নয় বোঝাতে): Paper is made from bamboo.
Stare at (চাওয়া বা তাকানো): He stares at me.
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Idioms
Beggar description - (অবর্ণনীয় হওয়া): The distress of the Muslims in Bosnia beggars description.
Give one’s right arm (বিপদের ঝুকি নেয়া): I will give my right arm if I could manage the tickets.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Of course (অবশ্যই): Of course, you know what that meant.
To the point (সঠিক) - The boy answered the question to the point.