📒 to force liquid at high pressure into rocks, deep holes in the ground, etc. in order to force open existing cracks (= narrow openings) and take out oil or gas
frack (for something) They have been fracking for oil in South Dakota since the fifties.
frack something Thousands of wells have been drilled and fracked in recent years.
frack something for something Some of the land is now being fracked for oil.