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Definition of retard verb from the Oxford Advanced American Dictionary

 

retard

 verb
verb
NAmE//rɪˈtɑrd//
 
retard something (formal)Verb Forms present simple I / you / we / they retard
 
he / she / it retards
 
past simple retarded
 
-ing form retarding
 
 
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to make the development or progress of something slower synonym delay, slow down The progression of the disease can be retarded by early surgery. The lack of a rail link retarded the town's development.
NAmE//ˌritɑrˈdeɪʃn//
 
noun [uncountable] Many factors can lead to growth retardation in unborn babies.
See retard in the Oxford Advanced Learner's Dictionary