1. a person or thing that makes something wider
2. a tool or device used to increase the width of something

Examples

• The road widener worked all summer to expand the highway.
• She used a shoe widener to make her boots more comfortable.
• The pipe widener helped the plumber increase the diameter of the opening.
• Construction crews brought in a lane widener for the bridge project.
• The metal widener stretched the ring to fit her finger.
• He bought a hat widener to adjust his vintage cap.