Backstairs : পিছন দিকের সিঁড়ি; চোরা সিঁড়ি;
Related Words
backdoors  backstairs  backstroke  backtrack  backwaters  boasters  See Words Also In
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Appropriate Prepositions
Affectionate to(স্নেহশীল): He is very affectionate to his baby.
Attain to (লাভ করা): He will not attain to his objective so soon.
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Bear hard upon (behave rudely-নির্দয়ভাবে ব্যবহার করা - V) Never bear hard upon your servants.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
Lump sum (এক কালীন) — He gave us lump sum money.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Up to (পর্যন্ত) - I have done the exercises up to page 40.