The phrase ‘get one’s head around’ means-
সঠিক উত্তর
To understand something challenging
The phrase ‘sine die means
ব্যাখ্যা:
To get one’s head around (phrase)
Meaning: 1. To understand something that is challenging or confusing
Bengali Meaning: বুঝে উঠতে পারা
Source: idioms.freeditionary.com