Definitions for gas up
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Princeton's WordNet
gas up(verb)
fill with gasoline
"Gas up the car"
Wiktionary
gas up(Verb)
To fill the gas tank of an automobile with fuel.
Citation
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"gas up." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/gas up>.

