Unfatiguable : অপরিম্লান;
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Appropriate Prepositions
Contribution to (অবদান): His invention made a major contribution to road safety.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
Entrust with (কোনো কিছু দ্বারা কাউকে বিশ্বাস করে): He entrusted me with the thing.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Bear hard upon (behave rudely-নির্দয়ভাবে ব্যবহার করা - V) Never bear hard upon your servants.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
To the brim (কানায় কানায়) - The river was full to the brim.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.