adjective
no longer alive or living :no longer having life
usage seedeceased</USAGER
To leave (someone or something) for dead is to leave a person or animal that you know will probably die instead of trying to help.
a deader -est [or more ~; most ~] :not able to feel or move
very tired
feeling no emotions
informal :certain to be punished or hurt
of a machine or device :no longer working especially because of not having electricity
no longer active or operating
naturally not living
deader -est [or more ~; most ~] :lacking in activity or excitement
used to describe a time when nothing is being said or done
no longer performed or enjoyed
of a language :no longer spoken
sports - used to describe a situation in which play stops during a game
complete, total, or absolute
sudden and complete
perfect or exact
(as) dead as a doornail
chiefly US or chiefly Brit (as) dead as a dodo
informal - used to stress that someone or something is dead
beat a dead horse
or flog a dead horse
catch/see (someone) dead
informal
If you say that people wouldn't/won't catch/see you dead or that you wouldn't/won't be caught/seen dead doing something, you refuse to let others see you doing it because it would cause you to be embarrassed.
dead and buried
or dead and gone
no longer living :dead
no longer used or accepted
dead from the neck up
informal :very stupid or foolish
dead in the water
informal :not making any progress :not having any chance of success
dead men tell no tales
dead on arrival
having died before getting to a hospital, emergency room, etc.
dead to rights
dead to the world
informal :sleeping very deeply
drop dead
informal
to fall to the ground and die very suddenly
used as a rude way to tell someone to leave you alone
knock dead
over my dead body
noun
plural dead
[plural] :people who have died
usually used with the
the dead :the state of being dead - usually used in the phrases rise from the dead or come back from the dead or return from the dead to mean to become alive again after dying
[noncount] :the time in the middle of the night or winter
adverb
completely or totally
in a sudden and complete way
directly or exactly