Wiktionary
Etymology 1 vb. 1 (context transitive US English) generate, devise or create. 2 To set up a snare. 3 To exaggerate. 4 stir up, stimulate, enliven, etc. Etymology 2
vb. (Archaic) to drink or become drunk, especially on gin.
Usage examples of "gin up".
I ordered a gin and tonic without any tonic, just the way Aramilo drank them, and I held the gin up to my nose and breathed it in, and it made me tingle with the promise of peace.
We'll get together again and gin up something for the three of us, maybe after the Commissioner's seven-year term is over.
It took two weeks of constant pressure to talk Michael into the job-far longer, in fact, than it took Kohler to gin up the paperwork to arrange the transfer.
But if cars had been invented after Macintoshes, carmakers would not have bothered to gin up all of these arcane devices.
His equanimity, Peabody realized, put the FBI agent in control of the situation and he reminded himself to try to gin up some more power.