In the long run( পরিশেষে ) You will have to suffer in the long run.
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 rainy day( দুর্দিন ) Everybody should save something for rainy day.
Of course( অবশ্যই ) Of course, you know what that means
pulling your leg( কৌতক করা ) Do not take it seriously, i was just pulling you leg
Square meal( পেট ভরা আহার ) He is too poor to have a square meal every day.