Duty bound : দায়বদ্ধ;
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Appropriate Prepositions
Add to (বৃদ্ধি করা, যোগ করা): The doll-dance in the exhibition added to our pleasure.
Admit to(ভর্তি করা): The boy was admitted to class Nine.
Call in(ডাকিয়া আনা): They called in a doctor.
Convinced of (আশ্বস্ত): You are convinced of his product.
Object to (আপত্তি করা): He objected to my proposal.
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Idioms
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Short cut (সংক্ষিপ্ত পথ)— He comes by this shortcut.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.