Septuagenarian : সর্ত্ত বৎসর বয়সের লোক;
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Appropriate Prepositions
Adhere to (লেগে থাকা, অটল থাকা): You should adhere to your principal.
Agree with, on, to(একমত হওয়া): My father agreed with me on this point, but he did not agree to my proposal to set up a canteen.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
Sentence to, for (দন্ডাদেশ দেওয়া): He was sentenced to death for murder.
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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.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
Call in question (সন্দেহ করা): No one can call his honesty in question.
On the whole (মোটের ওপর): On the whole, his conduct is good.