Definition of dead man:
(n) :
A dead man's switch.
(n) :
(slang) A bottle of alcoholic drink that has been consumed.
(n) :
(UK, slang, obsolete) An extra loaf stolen from a bakery by a servant who smuggles it into the customer's basket (and sometimes fraudulently charges it to the customer).
(n) :
Alternative form of deadman. [(obsolete) A corpse.]