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.
At stake ( বিপন্ন ) His life is at stake now.
Black sheep ( কুলাঙ্গার ) He is a black sheep in his family.
By leaps and bounds ( অতি দ্রুতগতিতে ) The population of Bangladesh is increasing by leaps and bounds.
In a nut shell ( খুব সংক্ষেপে ) Tell the story in a nut shell.
put a spoke to ones wheel ( কারও উন্নতিতে বাধা হওয়া )