Fall back on : অবলম্বন করা; সাহায্য গ্রহণ করা;
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fall back on  fallback on  See Words Also In
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Appropriate Prepositions
Composed of(তৈরী): This medicine is composed of vitamins and minerals.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Deaf to, of, in (না শোনা, বধির হওয়া): The boy is deaf to his father’s advice. This man is deaf of/in one ear.
Relation with (সম্পর্ক): I have no relation with the culprit.
Wish for (প্রত্যাশা করা): Everybody wish for happiness.
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Idioms
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
On the whole (মোটের ওপর): On the whole, his conduct is good.