On the spur of the moment ( মুহুর্তের উত্তেজনায় ) He did it on the spur of the moment.
Round the clock ( সমস্ত দিন ) He is working round the clock.
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.
On the contrary ( বিপরীত পক্ষে ) I do not hate him: on the contrary I love him.
In the mean time ( ইতিমধ্যে ) Lila will come here to-night. In the mean time you should get her room ready.
A bolt from the blue ( সম্পূর্ন অপ্রত্যাশিত ) The news of his father's death came to him as a bolt from the blue.