1. a device or tool that makes something larger, wider, or more open
2. a substance or agent that causes expansion or growth
Usage: technical
3. a muscle or anatomical structure that extends or opens a body part
Usage: anatomy

Examples

• The chest expander helped him build stronger muscles.
• A file expander can decompress large archives on your computer.
• The expander in the engine allows for better fuel efficiency.
• She used a metal expander to widen the ring to fit her finger.
• The expander device is commonly used in orthodontics to create space between teeth.
• The expander muscle in the back helps you straighten your spine.