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					Originally Posted by OverAndBack
					
				 
				It's possible it's statistically a sack. I used to have a book that had the NFL's statistical guidelines in it. 
			
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 I think they even credit one to a nearby defender if the ball slips out on the backswing without contact, or if the would-be passer runs out of bounds.
I remember a commentor on a college game on TV on ABC in the early '70s, maybe Lee Grosscup, but anyway a real loudmouth I disliked*, saying, "See that?  That's what we called a `sack'."  And it seemed to take off shortly after that, although that wasn't the very first time I'd heard it, so he was probably just picking up trendy jargon & BSing as if it were from his playing days.  Before that there was no good short term; you might see it listed in passing stats as "tackled".  It was still some time, however, before the yardage was subtracted from passing stats rather than running stats.
Robert
* Come to think of it, they all hire 
mostly loudmouths I dislike!