"retarding" in the verb sense
cause to move more slowly or operate at a slower rate
"This drug will retard your heart rate"
3. check, retard, delay
slow the growth or development of
"The brain damage will retard the child's language development"
4. decelerate, slow, slow down, slow up, retard
lose velocity move more slowly
"The car decelerated"
Source: WordNet® (An amazing lexical database of English)
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