Unbeknownst : অপ্রসিদ্ধ; অপরিজ্ঞাত;
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Appropriate Prepositions
Detrimental to (অপকারী): Smoking is detrimental to health.
Look up (ডিকশনারি থেকে শব্দার্থ খোঁজা): He is looking up a new word meaning from dictionary.
Lost in (মগ্ন): Simon is lost in meditation.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
Subject to (সাপেক্ষে): The man was appointed subject to the approval of the chairman.
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Idioms
Fair and square (সৎ): The learned persons should be fair and square.
Out of date (সেকেলে): This fashion is out of date.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.