A bolt from the blue ( সম্পূর্ন অপ্রত্যাশিত ) The news of his father's death came to him as a bolt from the blue.
By chance ( দৈবাৎ ) I met him on the way by chance.
Pros and cons ( খুঁটিনাটি ) You should consider the Pros and cons of the system.
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.
Breathe one's last ( মারা যাওয়া ) The old man breathed his last on Sunday last.
