Pros and cons ( খুঁটিনাটি ) You should consider the Pros and cons of the system.
put a spoke to ones wheel ( কারও উন্নতিতে বাধা হওয়া )
At one’s wit’s end ( হতবুদ্ধি ) He was at his wit’s end and did not know what to do.
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.
On the contrary ( বিপরীত পক্ষে ) I do not hate him: on the contrary I love him.
Cut to the quick ( মর্মাহত হওয়া ) I was cut to the quick by his words.