At fault : কিংকর্তব্যবিমূঢ়;
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Appropriate Prepositions
Abhorrent to(ঘৃণ্য): Racism of any kind is abhorrent to me.
Bridge over (সেতু): The only entrance to Allahabad in that direction was by a bridge over the Jumna.
Consent to(মত দেওয়া): My father did not consent to the proposal of my sister’s marriage.
Fond of (প্রিয়/অনুরাগী): Children are fond of sweets.
Free from (মুক্ত): He is now free from danger.
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Idioms
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
Lame excuse (বাজে ওজর): The lame excuse will not do.
Pin money (স্ত্রীর দেয়া হাত খরচ)— She saved her pin money.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.