Sound-wave : শব্দতরঙ্গ;
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Appropriate Prepositions
Adjacent to (সন্নিহিত): His house was adjacent to the bridge.
Cope with (এঁটে ওঠা; তাল মিলিয়ে চলা): They cannot cope with so much work.
Heir of (উত্তরাধিকারী): He is the heir of his father.
Married to (বিবাহিত): Salma was married to a Govt. Officer.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
Foul play (অসদাচারণ করা): We feared that he had met with foul play.
Let loose (বল্গাহীনভাবে ছেড়ে দেয়া): He let his horse loose in the field.
Man of straw (অপদার্থ): We do not care for a man of straw like you.