Pros and cons( খুঁটিনাটি ) You should consider the Pros and cons of the system.
All on a sudden( হঠাৎ ) All on a sudden a tiger came out of the bush.
Maiden speech( প্রথম বক্তৃতা ) His maiden speech fell flat on the audience.
By chance( দৈবাৎ ) I met him on the way by chance.
Read between the lines( তাৎপর্য বোঝা ) Try to read between the lines of the letter.
A blessing in disguise( বিপরীতে হিত ; প্রথমে খারাপ হিসেবে মনে হলেও পরবর্তীতে ভালো হয় ) Sam's motorcycle accident was a blessing in disguise because he got enough insurance money.