Loud speaker : শব্দ বিবর্ধক;
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loud speaker  loud-speaker  loudspeaker  See Words Also In
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Adorn with(সাজানো/সজ্জিত করা): Adorn the car with flowers.
Apply for(কারো কাছে আবেদন করা): Sumi applied to the Principal for free studentship.
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Thirst for (তৃষ্ণা, আকাঙ্ক্ষা): A wise man has no thirst for wealth.
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Idioms
Out of temper (ক্রুদ্ধ): The teacher is out temper to see the overall results.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.
Slow coach (অলস): You cannot expect much from a slow coach.
Slip of the tongue (বলায় সামান্য ভুল): This is a slip of the tongue; don’t pay much stress on it.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.