tap into

verb2

1. •
   To establish a connection with (something), especially in order to take advantage.
2. •
   To access (a resource or object).

   • When he ran out of money, he decided to tap into his trust fund.
   • 19 December 2014, Paul M Farber in The Guardian Online, Die-ins demand that we bear witness to black people's fears that they'll be next Though the current wave of die-ins began after grand juries in Ferguson and New York City refused to indict the cops who used lethal force against Michael Brown and Eric Garner, they tap into a deep well of what professor Salamishah Tillet calls “civic estrangement” from a state that ignores excessive police violence against black and brown people.