- a bar with one accurately straight edge, used for testing whether something else is straight直尺, 标尺, 校正尺。
- chiefly US (especially among fans of hardcore punk music) having an ascetic or abstinent lifestyle〈主美〉（尤指硬核朋克乐迷）苦行的; 禁欲的; 禁酒的：
he's so straight-edge that he won't even take Tylenol when he has a headache.
他是如此的一个苦行主义者, 即便是头疼时也不肯服用泰诺。