1,Do or die
This phrase means:
When you are in a situation in which you must take a big risk in order to avoid failure.
2,Swearing-in
Swearing-in is a formal ceremony,on which a person will make a formal promise to be honest or loyal,either being in the court or starting a new official job.For example,US will hold a swearing-in ceremony on Jan.20th for their newly-elected president every four year.
3,Swear away
To me,this phrase is quite new.But I believe that "swear away" is almost similar to the meaning of "swear off",which means:promise to be off from something,let's say,smoking and bad habits.