Keep a straight face : হাসি গোপন করা; হাসি সংবরণ করিয়া থাকা;
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Appropriate Prepositions
Attacked with(আক্রান্ত): He is attacked with …
Charge with(অভিযুক্ত করা): He is charged with killing.
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Identical with (একই ধরণের): You are identical with your sister.
Quarrel with (ঝগড়া করা): Some girls quarreled with one another.
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Idioms
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.
Show good manner (ভালো আচরণ প্রদর্শন ): You should show good manner in the company of young ladies.
White color job – (উচ্চ শ্রেনীর চাকরি, যেখানে শারীরিক কাজ নেই বললেই চলে- a job without manual labour) - He wants a white color job.