to raise in rate, power, size, classification, etc.; upgrade: to uprate a rocket engine.
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British Dictionary definitions for uprate
raise the value, rate, or size of, upgrade
photog to increase the effective speed of (a film) by underexposing, usually up to two stops, and subsequently overdeveloping (pushing the processing)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012