Definitions for slack up
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Princeton's WordNet
slack, slacken, slack up, relax(verb)
make less active or fast
"He slackened his pace as he got tired"; "Don't relax your efforts now"
Citation
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"slack up." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/slack up>.

