1. a ruler or other tool with a perfectly straight edge, used for drawing straight lines or checking if something is straight

1. describing a lifestyle that avoids alcohol, drugs, and sometimes tobacco and promiscuous behavior
Usage: informal; youth culture

Examples

• The architect used a straightedge to draw precise lines on the blueprint.
• She placed the straightedge against the board to check if it was warped.
• The geometry student needed a straightedge and compass for the construction.
• He's been straightedge since high school, never drinking or using drugs.
• The straightedge movement promotes a clean lifestyle free from substances.
• Many straightedge kids wear X's on their hands to show their commitment.