tailgate(n = noun.artifact) tailboard - a gate at the rear of a vehicle; can be lowered for loading;
is a kind of gate
is a part of beach waggon, beach wagon, estate car, station waggon, station wagon, waggon, wagon, motortruck, truck

   tailgate(v = verb.motion) - follow at a dangerously close distance; "it is dangerous to tailgate another vehicle"
is one way to follow
Derived form noun tailgater₁
Sample sentences: These cars won't tailgate

tailgate, n. & v.
--n.
1 esp. US a = TAILBOARD. b the tail door of an estate car or hatchback.
2 the lower end of a canal lock.
--v. US colloq.
1 intr. drive too closely behind another vehicle.
2 tr. follow (a vehicle) too closely.

Derivative:
tailgater n.