Definition of a dead certBritish, informal
- They're a dead cert to win.
: deprived of life : no longer alive
: having the appearance of death : deathly
: lacking power to move, feel, or respond : numb
: someone who is no longer alive : one that is dead (see 1dead 1)
: the state of being dead
: the time of greatest quiet
: absolutely, utterly
: suddenly and completely
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