A rainy day ( দুর্দিন ) Everybody should save something for rainy day.
Birds eye view ( মোটামোটি ধারণা ; এক নজর ) He took a bird’s eye view of the flood-stricken area from an aeroplane.
All at once ( হঠাৎ ) All at once a tiger came out of the forest.
At a low ebb ( নিম্নমুখী ) His fame is at a low ebb now.
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.
Chip of the old block ( বাপকা বেটা ) He is a chip of the old black.