Catch red handed( হাতে নাতে ধরা ) The thief was caught red handed.
At dagger drawn( খড়গহস্ত ) The two brothers are now at daggers drawn.
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.
Through thick and thin( বাধা বিপত্তির মধ্য দিয়ে ) Reveka followed her husband through thick and thin.
Slip of the tongue( বলায় সামান্য ভুল ) This is a slip of the tongue, don't lay much stress on it.
Black sheep( কুলাঙ্গার ) He is a black sheep in his family.