Under lock and key : তালাবদ্ধ;
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Appropriate Prepositions
Associate with, in(জড়িত হওয়া): This man was associated with crime.
Bad at (অদক্ষ): He is not bad at English.
Dull of (বধির; কানে শুনে না): He is dull of hearing.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
Look for (খোঁজা): I was looking for the lost phone.
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Idioms
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Bird’s eye view - (ভাসা ভাসা দৃশ্য, হালকাভাবে দর্শন): We took a bird’s eye view of the scenery.
In no time (শীঘ্র): He will finish the work in no time.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?