Books are a great source of happiness.

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

Bread and butter: I can't miss another day of work. That's my bread and butter.

Break off: After a few long and bitter arguments, they broke off their relationship.

Brevity is the soul of wit.

Buffalo = Buffalos

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

By developing infrastructure, engineer can lead his role to alleviate poverty.

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 using size, Swift shows the dreadful sides of the Europeans and their faults. Although some readers say that Swift uses size in Gulliver's Travels to satirize people positively, he uses satire to reveal the negative side of people showing their human pride, existence, and knowledge.

By whom was this bird being killed. 

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.