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Not to be confused with the tool known as a straightedge, or the song the subculture takes its name from, Straight Edge. Straight edge (sometimes abbreviated sXe or signified XXX or X) is a subculture of hardcore punk whose adherents refrain from using alcohol, tobacco and other recreational drugs, in reaction to the excesses of punk subculture.
Definition of 'leading edge'. leading edge. The leading edge of a particular area of research or development is the area of it that seems most advanced or sophisticated. I think Israel tends to be at the leading edge of technological development. ...leading-edge technology.