To the letter ( অক্ষরে অক্ষরে ) He followed my advice to the letter.
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.
At once finger ends ( নখদর্পণে ) All these facts are at his finger ends.
In lieu of ( পরিবর্তে ) Give me this pen in lieu of that.
Slow coach ( অলস প্রকৃতির লোক ) You cannot expect much from a slow coach like him.