dip into

verb2

1. •
   To spend some of a source of money (such as one's savings).

   • If people in the community wish HCHS to survive, then it's time they dip into the old checkbook and demonstrated their commitment. — 1976
2. •
   To read, examine or engage in (something) in a cursory or casual manner.

   • Dip into a nice book.