Water tight : জলাভেদ্য; জলরোধক;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Arrange for(ব্যবস্থা করা): We have arranged everything for our study tour.
Cause for (চিন্তিত হওয়ার কারণ): He has never given me any cause for concern.
Married to (বিবাহিত): Salma was married to a Govt. Officer.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
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Idioms
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.
Run short (কমতি পড়া) —I ran short of money.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.