By chance ( দৈবাৎ ) I met him on the way by chance.
Hard nut to crack ( কঠিন সমস্যা ) The problem of adult education is really a hard nut to crack.
In the nick of time ( ঠিক সময়ে ) The school team arrived in the nick of time.
Tooth and nail ( তীব্রভাবে ) He fought tooth and nail against his enemy.
bad shoot ( অসংগত অনুমান )
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.