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To ruin; wreck; mess up; screw up; sometimes as a bowdlerized substitution for f** up.

I'm not letting him use my computer again; he always jacks it up.

Additional definitions for 'jack up':

jack upTo raise, hoist, or lift a thing using a jack, or similar means.
jack upTo raise, increase, or accelerate; often said of prices, fees, or rates. See also jack up the price.
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"jack up." Phrases.net. STANDS4 LLC, 2017. Web. 10 Dec. 2017. <http://www.phrases.net/phrase/jack-up_753>.

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