In no time( শীঘ্র ) He will finish the work in no time.
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.
All at once( হঠাৎ ) All at once a tiger came out of the forest.
Out of the wood( বিপদমুক্ত ) He is not yet out of the wood.
In full swing( পুরাদমে ) The school is now in full swing.