Unsubstantiality : অসারতা; অসারত্ব;
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Appropriate Prepositions
Agree with, on, to(একমত হওয়া): My father agreed with me on this point, but he did not agree to my proposal to set up a canteen.
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Apply for(কারো কাছে আবেদন করা): Sumi applied to the Principal for free studentship.
Competent for(যোগ্য): He is not competent for the post.
Infested with (অতিষ্ঠ): The room is infested with rats.
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Idioms
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Tide over (বিপদ অতিক্রম করা-overcome ): The manager tided over the situation.