[Ask ] walk the line

[imluh (旅行是我的生理需求)]

 what does the prase"walk the line" means?

 I knew the phrase from the movie"Walk the line" but I didn't get it.

 Please help me.

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推 ting0901:what is the movie about? i've never heard of it!
→ outofdejavu:Google it, and you'll know
→ outofdejavu:www.hollywoodjesus.com/walk_line_spiritual.htm
→ outofdejavu:This might help. On the page, Craig Detweiler talk
→ outofdejavu:about the "lines" Johnny Cash walked