At once finger ends ( নখদর্পণে ) All these facts are at his finger ends.
loose cannon ( অপ্রত্যাশিত ) He is a bit of a loose cannon.
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.
a piece of cake ( খুবই সহজ ) This assignment is a piece of cake
Out of the wood ( বিপদমুক্ত ) He is not yet out of the wood.