say it: DED-hed
deadhead is a noun meaning "a nonenterprising person who is not paying his way". It carries 2 recorded senses.
a nonenterprising person who is not paying his way
“the deadheads on the payroll should be eased out as fast as possible”
a train or bus or taxi traveling empty
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for deadhead come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.