Learned শব্দের অর্থ (জ্ঞানী/পণ্ডিত)।

Outbreak অর্থ প্রাদুর্ভাব।

The word "aim" in this passage means pointing the gun towards the dove by the hunter.

"Stray initiatives" stands for unplanned efforts or efforts that are taken to revamp or to modernize something without prior preparation. So stray initiatives are the fortuitous initiatives to mend something.

Pillar box stands for post box which is used for sending letters, cards etc from pillar to post.

Collateral is something that we promise to give someone if we can not pay back loan. Besides, it indicates property pledged by a borrower to protect the interest of the lender.