By chance ( দৈবাৎ ) I met him on the way by chance.
Cut to the quick ( মর্মাহত হওয়া ) I was cut to the quick by his words.
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 a nut shell ( খুব সংক্ষেপে ) Tell the story in a nut shell.
By and by ( শীঘ্র ) He will come here by and by.
In full swing ( পুরাদমে ) The school is now in full swing.