plus-up
n.— «Convinced that the company’s engine technologies were important, with the help of Virginia Sens. Warner and Allen they were able to add what’s called a “plus-up” to the 2006 defense appropriations bill. (That’s money for a program not part of the President’s request.)» —“Military turns to Synchrony to develop aircraft engine” by Andrew Kantor Roanoke Times (Virginia) June 17, 2006. (source: Double-Tongued Dictionary)