Beat the air : বৃথা চেষ্টা করা; অনর্থক পরিশ্রম করা;
Related Words
bather  batter  battery  beat the air  beater  better  See Words Also In
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Ashamed of(লজ্জিত): Nandini was ashamed of his wrong-doing.
Close to(নিকটে): Our College is close to the Post Office.
Eager for, about (একাগ্র): The students for this school are eager for knowledge. The teacher is eager about the success of his students.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
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Idioms
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.