Alarm clock : ঘুম ভাঙ্গাইবার জন্য শব্দকর ঘড়ি; অ্যালার্মঘড়ি;
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alarm clock  alarm-clock  See Words Also In
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
Repentant for (অনুতপ্ত): Kamal should be repentant for his misbehavior.
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Idioms
In no time (শীঘ্র): He will finish the work in no time.
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.
Set free (মুক্ত করা): The prisoners were set free.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.