Loud-speaker : সস্বরবর্ধক যন্ত্র,
Related Words
loud speaker  loud-speaker  loudspeaker  See Words Also In
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Concerned with(জড়িত): She was concerned with such things.
Object to (আপত্তি করা): He objected to my proposal.
Repent on (নির্ভরশীল): He is repent on his parents.
Repentance for (অনুতাপ): He has repentance for the past.
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Idioms
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Hush money (ঘুষ): He offered a hush money to disclose the file.
In the wake of (ঠিক পরে): Police came in the wake of the accident.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.