By mistake : ভুলবশত; ভ্রমক্রমে; ভ্রান্তিবশত;
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Appropriate Prepositions
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Grasp at (আঁকড়িয়ে ধরা): He grasped me at my hand.
Point out (চিহ্নিত করা): Point out the mistakes from the book.
Rid of (মুক্তি দেওয়া): He will get rid of troubles soon.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
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.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
Safe and sound (নিরাপদে)— He reached home safe and sound.
Set out (যাত্রা করা)— I will set out in time.