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.
Red letter day( স্মরণীয় দিন ) The 21 February is a red letter day in the history of Bangladesh.
At once finger ends( নখদর্পণে ) All these facts are at his finger ends.
Set free( মুক্ত করা ) The prisoners were set free.
Out of doors( বাহিরে ) It is rather cold out of doors.
In full swing( পুরাদমে ) The school is now in full swing.