Guard against : আগে থেকে সাবধান হওয়া; সতর্ক থাকা; তাড়ান;
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Appropriate Prepositions
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Fed up with (বিরক্ত): He is fed up with waiting for her.
Rely on (নির্ভর করা): We should not rely on a lazy man.
Urge upon (আহবান জানানো): She urged upon his son the importance of being honest.
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Idioms
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Three score (ষাট): He is happy as his brother got three score.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.