To and fro ( এদিন-ওদিক ) Being unable to make up his mind the man is walking to and fro.
Through thick and thin ( বাধা বিপত্তির মধ্য দিয়ে ) Reveka followed her husband through thick and thin.
In cold blood ( ঠান্ডা মাথায় ) They committed this murder in cold blood.
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 full swing ( পুরাদমে ) The school is now in full swing.