Definition of retards:
(n) :
(offensive, dated) A person with mental retardation.
(n) :
(informal, offensive) A person or being who is extremely stupid or slow to learn.
(n) :
A retardation; a delay.
(n) :
(music) A slowing down of the tempo; a ritardando.
(v) :
(transitive) To keep delaying; to continue to hinder; to prevent from progressing.
(v) :
(intransitive) To decelerate; to slow down.