Rudiment : মূলনীতি, সূত্র বা তত্ত্ব;
Related Words
radiant  radiometer  red meat  rodent  rodents  rudiment  rudimental  rudimentary  rudiments  See Words Also In
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Appropriate Prepositions
Apart from(ছাড়া, ব্যতীত, দূরে): They pave apart from each other.
Covetous of(লোভী হওয়া): He is covetous of wealth.
Debar from (বঞ্চিত হওয়া/বাধা দেওয়া): He is debarred from getting a job.
Sorry for (দুঃখিত): He is sorry for his misdeeds.
Thirst for (তৃষ্ণা, আকাঙ্ক্ষা): A wise man has no thirst for wealth.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.