Sound wave : শব্দ-তরঙ্গ;
Related Words
sound box  sound effects  sound off  sound wave  sound-wave  See Words Also In
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Appropriate Prepositions
Absorbed in(মগ্ন): I am absorbed in my study.
Adequate to(সমানুপাতিক): The salary, he gets, is not adequate to the volume of work he has to do.
Afraid of(ভীত): An honest man is not afraid of telling the truth.
Perfect for (সঠিক, মানানসই): The new book is perfect for you.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Nip in the bud (অঙ্কুরে বিনষ্ট হওয়া): All his hopes were nipped in the bud.
Run into debt (ঋণগ্রস্ত হওয়া)— He ran into debt.
Short temper (রগচটা)— He is a man of short temper.