All on a sudden ( হঠাৎ ) All on a sudden a tiger came out of the bush.
By all means ( সবর্প্রকার ) Try to do it by all means.
Lion's share ( সিংহভাগ ) He took the lion's share of the profit.
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 full swing ( পুরাদমে ) The school is now in full swing.
A bolt from the blue ( সম্পূর্ন অপ্রত্যাশিত ) The news of his father's death came to him as a bolt from the blue.