Guess I learned something new today. I've always thought "toe the line" means something closer to "staying as close as you can to the line without crossing it", if that makes sense.
Agreed, that's what I thought it meant when I used the phrase :)
It's probably common enough to be an accepted meaning nowadays, like what's happened with "beg the question". I think the original meaning also lends itself very well to people believing the phrase is "tow the line" since that makes some sense with conforming to a rule. Who knows, idioms are a moving target.