retard(noun) a person of subnormal intelligence
(verb) cause to move more slowly or operate at a slower rate; "This drug will retard your heart rate"
(verb) lose velocity; move more slowly; "The car decelerated"
(verb) slow the growth or development of; "The brain damage will retard the child's language development"
(verb) be delayed
Source:
WordNet 2.0 Copyright 2003 by Princeton University. All rights reserved.
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