get one's arms around

verb2

1. •
   To fully understand; to wrap one's head around; to get a handle on.

   • Rather, it is the way Pekka needs to get his arms around the data before making up his own mind. — 2003
2. •
   To manage, handle, or control; to get on top of.

   • Meese arrived back at the Justice Department at 12:45 p.m. and advised Reynolds, Cooper, and Richardson that the President had authorized him to "get his arms around the Iranian initiative." — 1995