According to The Oxford Dictionary, the word ‘assiduity’ means ‘steadfastness’, which refers to showing great care, attention, and persistent effort in doing something. It emphasizes continuous diligence and unwavering commitment toward a task or goal.

• ‘Assiduity’ originates from the Latin word assiduus, meaning constant or unremitting.
• It denotes regularity, devotion, and tireless application in one’s duties.
• The word is often associated with hard work done patiently over time.
• Example: He completed the research with remarkable assiduity.
• Synonyms include diligence, perseverance, industriousness, constancy, and steadfastness.
• In moral or professional contexts, assiduity reflects a person’s discipline, consistency, and commitment to excellence.

• The required answer is - A connection or link between two or more things.

• Nexus (noun)
English Meaning: An important connection between the parts of a system or a group of things.
Bangla Meaning: সংযোগ; বন্ধন; সম্বন্ধ; পরস্পরসম্বন্ধ শ্রেণি।

Example Sentence:
- Education is often the nexus between poverty and opportunity.
- This city serves as a nexus for trade routes between East and West.
- Her research explores the nexus of technology and ethics.

Come down on

• English Meaning: to punish or criticize a person or activity very strongly

• Bangla Meaning: তীব্র সমালোচনা করা, শাস্তি দেওয়া

• Example Sentence: They're coming down heavily on people for not paying their license fees.

• Bangla Meaning: লাইসেন্স ফি না দেওয়ায় কর্তৃপক্ষ জনগণের উপর খুব কড়াকড়ি আরোপ করছে।

Clarification on other options:

• Come down with → অসুস্থ হওয়া, যেমন: He came down with the flu.

• Come by / Drop by → কোনো জায়গায় হঠাৎ যাওয়া বা আসা, যেমন: She dropped by my house yesterday.

• Give in / Surrender → পরাজয় স্বীকার করা বা আত্মসমর্পণ করা।

সঠিক ব্যবহার: কোনো ব্যক্তি বা কর্মকাণ্ডের উপর কঠোর সমালোচনা বা শাস্তি আরোপের ক্ষেত্রে come down on ব্যবহৃত হয়।