By the by ( প্রসঙ্গক্রমে ) By the by I came to know that he was ill.
Black sheep ( কুলাঙ্গার ) He is a black sheep in his family.
In the nick of time ( ঠিক সময়ে ) The school team arrived in the nick of time.
In force ( বলবৎ ) This law is in force now.
Take to one's heels ( ছুটিয়া পালানো ) The thieves took to their heels to see the police.
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.