Lost labour : নিষ্ফল শ্রম; বেকার খাটনি;
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Appropriate Prepositions
Dwell in (বাস করা): He dwells in a tall apartment.
Grasp at (আঁকড়িয়ে ধরা): He grasped me at my hand.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Stick to (দৃঢ়ভাবে লেগে থাকা): We should always stick to our decisions.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Short temper (রগচটা)— He is a man of short temper.