Costless : মূল্যহীন;
Related Words
casteless  castles  costless  costliest  cutlass  See Words Also In
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Appropriate Prepositions
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Indulge in (আসক্ত): You should not indulge in social media.
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
Qualified for (যোগ্য প্রতিপন্ন হওয়া): No candidate was properly qualified for the post.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
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Idioms
All along - (সব সময়): I was present in the meeting all along.
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
In the wake of (ঠিক পরে): Police came in the wake of the accident.
On the wane (হ্রাসমান): His fame is on the wane now.
Riding for a fall (বেপরোয়াভাবে কাজ করা- to act recklessly): He rides for a fall in the election.