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Providing the network with enough premium ads to mask any losses from lower CPM to keep the overall placement above a given margin.
Capital One is providing cover fire for National City on the Yahoo placement.
by JDubinthehizzy September 10, 2008
Pissing really loudly in a public restroom so the guy in the stall can rip a nasty crap without embarrassment.
Dude 1: Bro, thanks for laying down that cover fire, I had tacos for lunch.

Dude 2: No prob buddy! I just drank a big gulp, so that worked out great!
by Gaylando May 01, 2009