Hard and fast( বাঁধা ধরা ) There is no such hard and fast rule in this matter.
by dint of ( ফলে (সাধারণত বল প্রয়োগের ফলে) )
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.
In vain( বৃথা ) All his attempts were in vain.
A black sheep( কুলাঙ্গার ) Tom is a black sheep in their family
By chance( দৈবাৎ ) I met him on the way by chance.
