Today is Slang Sunday. So, here's the phrase of the day: the pocket.
In football, when the quarterback drops back to pass, the offensive line -- the center, guards and tackles -- is blocking the defense. The defensive line pushes forward, the offensive line is pushing back and holding them at bay. As that happens a "pocket" is usually formed, which allows the QB protection and, at times, they can even step into it. So the pocket can = protection.
Chat it up and enjoy!