Cornerstone : ভিত্তি; ভিত্তি-প্রস্তর;
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corner-stone  cornerstone  cornerstones  See Words Also In
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Appropriate Prepositions
Absorbed in(মগ্ন): I am absorbed in my study.
Ask for (কোনো কিছু চাওয়া): Do not ask him for any help because he doesn’t like to help anyone.
Aware of(অবগত): I am not aware of his dishonesty.
Hope for (আশা করা): Let us hope for the best.
Indulge in (আসক্ত): You should not indulge in social media.
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Idioms
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
Cut a sorry figure (খারাপ ফল করা): He cuts a sorry figure in the examination.
Pack up a quarrel (ঝগড়া মিটানো)— He packed up their quarrel.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.