Non-returnable : অ-ফেরতযোগ্য; অপ্রত্যর্পণীয়;
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non-returnable  nonreturnable  See Words Also In
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Assure of(আশ্বাস দেওয়া): I can assure you of the Principal’s honesty.
Cast aside (ছুঁড়ে ফেলা): As soon as they become rich they cast aside their poor friends.
Compensate for(ক্ষতিপূরণ করা): I will compensate him for the loss.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
All in - (পরিশ্রান্ত): I was all in after the meeting.
At home (comfortable— আরাম) He feels at home in Dhaka now.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.