Blue blood (আভিজাত্য) Don't boast of your blue blood.

Boar- Sow

Bolt from the blue (বিনা মেঘে বজ্রপাত) This news was bolt from the blue for Naeem sir

Books are a great source of happiness.

Bread and butter (জীবিকা) At present, Govt. Job is mine bread and butter.

Brevity is the soul of wit.

Buffalo = Buffalos

কিন্তু ছাত্ররা কঠোর পরিশ্রম করতে চায় না যা ভাল ফলাফলের জন্য আবশ্যক।

By and large= নিকটে তথা প্রচুরের/ সীমার নিকটবর্তী = statement is mostly but not completely true.

By dint of = বদৌলতে

By means of (উপায়ে/গুণে) You can earn money by means of hard work.

By means of (উপায়ে/গুণে) You can earn money by means of hard work.

By whom will you be helped?   = Who will help you?

Can their glory ever fade?   = Their glory can never fade.

Canada is one of the coldest countries in the world. (Comparative) = Canada is colder than most other countries in the world.