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1. A hinged part that extends across the rear of a pickup truck or other vehicle and can be folded down or to a horizontal position for loading and unloading.
2. One of the pair of gates downstream in a canal lock.
v. tail·gat·ed, tail·gat·ing, tail·gates
To drive so closely behind (another vehicle) that a collision is likely if that vehicle brakes suddenly.
1. To follow another vehicle too closely.
2. To participate in a tailgate party.