straight edgenoun [ C ]
uk/ˌstreɪt ˈedʒ//ˌstreɪt ˈedʒ/an object such as a ruler or a piece of wood, used for drawing or checking straight lines:
Use a straight edge for cutting the fabric.
straight edgeadjective
also straight-edge /ˈstreɪt ˌedʒ//ˈstreɪt ˌedʒ/also straight-edgedhaving an edge that is straight rather than curved or irregular:
Use a straight-edge knife.
having a way of life that does not involve doing anything considered to be unhealthy or immoral:
He's very straight edge now - no drinking, no smoking.