Ack-ack : বিমান-বিধ্বংসী; বিমান-ধ্বংসী;
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acacia  ack-ack  ackack  See Words Also In
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Appropriate Prepositions
Appeal to, for(কোন ব্যক্তির কাছে কোন কিছুর জন্য আবেদন করা): The flood affected people appealed to the President for reef.
Apply to (কারো কাছে আবেদন করা): He applied to the principal for free admission.
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Dull of (বধির; কানে শুনে না): He is dull of hearing.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
All along - (সব সময়): I was present in the meeting all along.
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Man of letters (পন্ডিত ব্যক্তি): You are truly a man of letters.