At fault : কিংকর্তব্যবিমূঢ়;
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Appropriate Prepositions
Attention to(মনোযোগ): He has no attention to his studies.
Call for(চাওয়া): I will call for his explanation.
Eager for, about (একাগ্র): The students for this school are eager for knowledge. The teacher is eager about the success of his students.
Faithful to (বিশ্বস্ত): The dog is very faithful to its master.
Rely on (নির্ভর করা): We should not rely on a lazy man.
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Idioms
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Breathe one’s last (decease, die- শেষ নিঃশেষ ত্যাগ করা, মরে যাওয়া) The man breathed his last in his native village.
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.