jack up verb 10jack-up noun 2forms 4 verb10 •To raise, hoist, or lift a thing using a jack, or similar means.He jacked the car up to change the tireThe oil rig can be jacked up higher when the hydraulic legs touch the sea floor. •(informal) To raise, increase, or accelerate; often said of prices, fees, or rates.I can't believe they're going to jack up the price of gasoline again — and after they already raised it twenty cents a gallon! •(informal) To ruin; wreck; mess up; screw up; sometimes as a bowdlerized substitution for fuck up.I'm not letting him use my computer again; he always jacks it up. •(slang) To inject a drug into (oneself) intravenously.And I've had scag, I've had speed / I've jacked up until I bleed / So what, so what? — 1981 •(slang) To improve or embellish on (something).I jacked up the recipes with some fresh ingredients. •(informal) To criticize, discipline or reprimand. •(informal) To refuse to follow an order. •(informal) To shoot, especially in the context of a poor shot opportunity. •(New-Zealand) To organise something. •(dialect, no longer used) To give up; to abandon (something, e.g. a job, contract)Says I, “Let's jack up, man alive, / An' try further down on the Creek!” / “All right!” says my mate, “but we'll drive / Right an' left to the end of this week.” — 1881 jack-up noun2 •An increase or rise; usually said of prices, fees, or rates.It’s hard to stay in business with the recent jack-up in fuel costs. •[before a noun] A machine that uses jacks or hydraulic lifts.The second phase of resilience work at Dawlish station began on November 5, with the arrival off the coast of an eight-legged walking jack-up barge known as a Wavewalker. — 2020 formsjacked up · jacking up · jacks up · jack-ups