Water tight : জলাভেদ্য; জলরোধক;
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Appropriate Prepositions
Abound with(ছেয়ে থাকা): They live in a region that abounds with oil.
Bound for(প্রস্তুত থাকা): Although we can see that it is bound for failure, it is fascinating to follow its journey.
Covetous of(লোভী হওয়া): He is covetous of wealth.
Remedy for (প্রতিকার): There is no remedy for his misbehavior.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
Hush money (ঘুষ): He offered a hush money to disclose the file.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
Of course (অবশ্যই): Of course, you know what that meant.
To the point (সঠিক) - The boy answered the question to the point.