Long-standing : দীর্ঘকালস্থায়ী
Related Words
long standing  long-standing  longstanding  See Words Also In
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Appropriate Prepositions
Careless of(অসতর্ক): Do not be careless of your health.
Dependent on (নির্ভরশীল): Sepm is dependent on his father.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Run over (চাপা পড়া): The man was run over by a truck.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
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Idioms
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Out of order (বিকল): The elevator was out of order.
Safe and sound (নিরাপদে)— He reached home safe and sound.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.