verb inject liquid into (a subterranean rock formation, borehole, etc.) at high pressure so as to force open existing fissures and extract oil or gas.
"millions of gallons of water are needed to successfully frack a single well"
extract (oil or gas) by injecting liquid into a subterranean rock formation, borehole, etc. at high pressure.
"the industry has begun to frack natural gas from shale deposits"
