By the by ( প্রসঙ্গক্রমে ) By the by I came to know that he was ill.
At home ( দক্ষ ) He is at home in mathematics.
Above board ( সংশয়হীন ভাবে নির্দোষ ) His activities are open and above board.
keep your chin up ( সুখি হওয়া ) His attempt keep your chin up
Birds eye view ( মোটামোটি ধারণা ; এক নজর ) He took a bird’s eye view of the flood-stricken area from an aeroplane.
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.