Valid : বৈধ; যুক্তিসিদ্ধ;;
Related Words
valid  validate  validated  valued  vaulted  veld  See Words Also In
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Appropriate Prepositions
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Die of, for, from (মারা যাওয়া): He died of cholera. He died for his country. He died from an injury.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
Run on (বিরতিহীন চলা): The bus is running on time.
Stick to (দৃঢ়ভাবে লেগে থাকা): We should always stick to our decisions.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
On the wane (হ্রাসমান): His fame is on the wane now.