To nullify : বাতিল করা;
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Appropriate Prepositions
Bar to(বাধা): Poverty is not a bar to happiness.
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Faithful to (বিশ্বস্ত): The dog is very faithful to its master.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Urge upon (আহবান জানানো): She urged upon his son the importance of being honest.
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Idioms
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
Nip in the bud (অঙ্কুরে বিনষ্ট হওয়া): All his hopes were nipped in the bud.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.