A sack is when the quarterback is tackled behind the line of scrimmage before he can throw a forward pass/lateral. Tackling the quarterback behind the lime of scrimmage on a running play is not considered a sack.
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Sacking in war means looting and destroying.
They were hastened by the Roman sacking of Jerusalem, and the persecution of Jews in Spain.
nickleback
Kyle Orton is the first-string quarterback. Brady Quinn is the second-string quarterback. Tim Tebow is the third-string quarterback. And as of the time of this answer, Tom Brandstater is the fourth-string quarterback.
QB is another way to say quarterback so I'm guessing it is quarterback-ness or in other words the quality of a person being a quarterback.