Out of date( অপ্রচলিত ) This fashion is now out of date.
By and by( শীঘ্র ) He will come here by and by.
By chance( দৈবাৎ ) I met him on the way by chance.
Dead of night( মধ্য রাত্রি ) The robbers broke into the house at dead of night.
To and fro( এদিন-ওদিক ) Being unable to make up his mind the man is walking to and fro.
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.