Non availability : অপ্রাপ্তি;
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Appropriate Prepositions
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Hard of (কানে খাটো বা কম শোনা): Ratan is a hard of hearing.
Repent of (অনুতাপ করা): I repented of my past.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.