1. wedge-shaped blocks used to prevent something from moving, especially wheels or other round objects
Usage: plural form of chock
2. heavy metal or wooden supports used to hold a boat or ship in place
Usage: nautical

Examples

• The pilot placed chocks behind the airplane’s wheels.
• Remove the wheel chocks before driving away.
• The mechanic used rubber chocks to secure the car.
• The boat was held steady by wooden chocks.
• Safety regulations require chocks when parking large vehicles.
• The trailer’s chocks prevented it from rolling backward.