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.
In force( বলবৎ ) This law is in force now.
End in smoke( ব্যর্থ হওয়া ) All his plans ended in smoke.
In vogue( চালু ) This custom is not in vogue now.
In order to ( উদ্দেশ্য ) He came here in order to meet my mother.
