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
Absorbed in(মগ্ন): I am absorbed in my study.
Apply to (কারো কাছে আবেদন করা): He applied to the principal for free admission.
Consent to(মত দেওয়া): My father did not consent to the proposal of my sister’s marriage.
Crave for(আকাঙ্ক্ষা করা): Everyone craves for care.
Full of (পরিপূর্ণ): Our Rivers are full of fishes.
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Idioms
In the long run (পরিণামে): You will have to suffer in the long run.
Run high (বেড়ে যাওয়া) —The price of everything has run high.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.
Without fail (অবশ্যই) - You must attend the meeting without fail.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.