1. a wrinkle or crease on the face, especially around the eyes or mouth, caused by frequent smiling or laughing
Usage: often used in plural form 'laugh lines'; commonly associated with aging and facial expression
2. a humorous line or joke in a script, performance, or written work intended to provoke laughter from an audience
Usage: entertainment and comedy contexts

Examples

• She had developed laugh lines around her eyes from years of smiling.
• The comedian delivered the perfect laugh line that had the entire audience roaring.
• Laugh lines are a natural part of aging and can add character to a face.
• The writer inserted a clever laugh line into the script to break up the tension.
• Her laugh lines deepened as she grinned at the funny story.
• Every good comedy needs at least one strong laugh line per scene.