deadhead

adv. with no passengers or freight

v. go to a performance without paying the admission fee; fly a plane carrying no passengers or freight; drive a vehicle (such as a bus, train or taxi) empty (with no passengers); pull out dead flowers from a plant

n. plane carrying no passengers or freight; vehicle (such as a bus, train or taxi) that travels empty (with no passengers); one who goes to a performance without paying the admission fee; fan of the rock band "The Grateful Dead"; faded flower head; (Slang) unintelligent person

For other meanings of this word, see Deadhead (disambiguation) Deadhead or Dead Head is a name given to fans of the American jam band, The Grateful Dead.
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Noun
1. a nonenterprising person who is not paying his way; "the deadheads on the payroll should be eased out as fast as possible"
(hypernym) nonworker
2. a train or bus or taxi traveling empty
(hypernym) public transport

(n.)
One who receives free tickets for theaters, public conveyances, etc.
  

(n.)
A buoy. See under Dead, a.
  

1) Any water-soaked wooden pile, tree, or log that is floating just awash in a nearly vertical position. A menace to small boats and to the propellers of vessels. 2) A tow returning from a trip without barges or with empty barges. (TNDOT1)

Miles and hours that a vehicle travels when out of revenue service. This includes leaving and returning to the garage, changing routes, etc., and when there is no reasonable expectation of carrying revenue passengers. However, it does not include charter service, school bus service, operator training, maintenance training, etc. For non-scheduled, non-fixed-route service (demand responsive), deadhead mileage also includes the travel between the dispatching point and passenger pick-up or drop-off. (FTA1)