When someone tailgates, they drive too closely behind another vehicle.
Tailgating is dangerous and can make other drivers feel scared or angry.
Examples:
He tailgates the car in front of him.
She doesn't like it when someone tailgates her.
The truck tailgates the small car.
The cat tailgates the dog, trying to get some food.
He always tailgates, even though it's not safe.
The spaceship tailgates the asteroid, trying to land on it.