Bring to book ( শাস্তি দেওয়া ) He should be brought to book for his misconduct.
Hold good ( প্রযুক্ত হওয়া ) This ruls will not hold good here.
By the by ( প্রসঙ্গক্রমে ) By the by I came to know that he was ill.
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 vain ( বৃথা ) All his attempts were in vain.
To and fro ( এদিন-ওদিক ) Being unable to make up his mind the man is walking to and fro.
