Definition of "retard"
retard
/ɹɪˈtɑː(ɹ)d/
verb
third-person singular simple present retards, present participle retarding, simple past and past participle retarded
(intransitive) To decelerate; to slow down.
third-person singular simple present retards, present participle retarding, simple past and past participle retarded
(intransitive) To decelerate; to slow down.