One of the boys was absent yesterday. 

one of my friends is a lawyer

One of my friends are a lawyer.   = One of my friends is a lawyer

Once in a blue moon = কালেভদ্রে - He comes to his village one in a blue moon

Once an ant was very thirsty. He went to the pond to drink water.

used to show that you think or feel the opposite of what has just been stated: "I thought you said the film was exciting?" "On the contrary, I nearly fell asleep half way through it!" I'm not angry with you. On the contrary!

On and off (মাঝে মাঝে) - It rained on and off all day.

Let your parents be obeyed

Oasis= Oases

Nobody believes a liar. (Interrogative) = Who believes a liar?

No sooner had he taken the money than he went away. 

Shakib is the best player in the team.

No one can do this. (Interrogative) = Who can do this?

No news is good news. = কোন খবর না থাকাটাই সুখবর।

Nip in the bud (destroy at beginning): অঙ্কুরে বিনষ্ট হওয়া All his hopes are nipped in the bud. তার সকল আশা অঙ্কুরে বিনষ্ট হল।