1. the vertical walls on the sides of a room, building, or structure
2. the sides of a tire between the tread and the rim
Usage: automotive
3. the vertical surfaces at the sides of a swimming pool

Examples

• The sidewalls of the garage were painted white.
• She hung pictures on both sidewalls of the hallway.
• The tire’s sidewalls showed signs of cracking from age.
• Check your tire pressure and inspect the sidewalls regularly.
• The swimmer pushed off from the pool’s sidewalls during practice.
• The basketball court had advertisements painted on its sidewalls.
• Damage to the tire’s sidewalls can be dangerous while driving.