Gala Day( উৎসবের দিন ) The 15th August is a gala day to the Indians.
On the spur of the moment( মুহুর্তের উত্তেজনায় ) He did it on the spur of the moment.
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 and large( প্রধানতঃ ) People in our village are by and large farmers.
slap on the wrist( মৃদু শাস্তি ) Although he broke the rules, he was only given a slap on the wrist