Once in a blue moon : নমাসে ছমাসে;
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Appropriate Prepositions
Agree to(ব্যক্তি ছাড়া অন্যকিছুর সাথে একমত হওয়া): We cannot agree to your proposal.
Attest to(প্রত্যয়ন করা): I like to attest to your ability.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
Similar to (সদৃশ): My T-shirt is similar to yours.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Set free (মুক্ত করা): The prisoners were set free.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.
White color job – (উচ্চ শ্রেনীর চাকরি, যেখানে শারীরিক কাজ নেই বললেই চলে- a job without manual labour) - He wants a white color job.