Above board( সংশয়হীন ভাবে নির্দোষ ) His activities are open and above board.
Come to light( প্রকাশিত হওয়া ) Their private talk has come to light at last.
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.
By the by( প্রসঙ্গক্রমে ) By the by I came to know that he was ill.
Dead of night( মধ্য রাত্রি ) The robbers broke into the house at dead of night.