Once in a while : কখনোসখনো; মাঝেমাঝে; কখন-সখন; কখন কখন; বড় একটা নহে;
Related Words
once in a while  onceinawhile  See Words Also In
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Appropriate Prepositions
Careful of (সতর্ক): He is very careful of his fault.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Quick at (চটপটে): A cashier must be quick at figures.
Relation with (সম্পর্ক): I have no relation with the culprit.
Sentence to, for (দন্ডাদেশ দেওয়া): He was sentenced to death for murder.
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Idioms
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.