By far( সর্বাংশে ) He is by far the best boy in the class.
Tooth and nail( তীব্রভাবে ) He fought tooth and nail against his enemy.
By chance( দৈবাৎ ) I met him on the way by chance.
Die in harness ( কর্মরত অবস্থায় মারা যাওয়া ) Dr. Sen died in harness.
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.
A bolt from the blue( সম্পূর্ন অপ্রত্যাশিত ) The news of his father's death came to him as a bolt from the blue.
