Invalidating : বাতিল করা; অসিদ্ধ করা; ব্যর্থ করা;
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inflating  invalidating  See Words Also In
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Appropriate Prepositions
Attentive to(মনোযোগী): He is attentive to his business.
Conceal from(লুকানো) Do not conceal anything from me.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Worry about (কোনো কিছু বা কাউকে নিয়ে উদ্বিগ্ন হওয়া): Please, don’t worry about me. I will be alright.
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Idioms
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
In black and white – (লিখিতভাবে) – Put forward your proposal in black and white.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.
White color job – (উচ্চ শ্রেনীর চাকরি, যেখানে শারীরিক কাজ নেই বললেই চলে- a job without manual labour) - He wants a white color job.