Pros and cons ( খুঁটিনাটি ) You should consider the Pros and cons of the system.
At a loss ( হতবু্দ্ধি ; কিংকর্তব্যবিমূঢ় ) He was at a loss and did not know what to do.
Do yeoman's service ( বিশেষ উপকার করা ) Raja Rammohan Roy has done yeoman's service to our country.
Three R's ( প্রাথমিক শিক্ষা ) The majority of our people have not yet learnt the three R's.
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.