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English definition of “retard”

retard

verb [T] uk   /rɪˈtɑːd/ us    /-ˈtɑːrd/ formal
to make something slower: A rise in interest rates would severely retard economic growth.Delaying and wasting timeIncreasing and decreasing speed of motion

retard

noun [C] uk   /ˈriː.tɑːd/ us    /-tɑːrd/ offensive
a stupid or mentally slow person: I'm not playing with him, he's a total retard.Stupid and silly people
(Definition of retard from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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