"slowing" in the noun sense

1. deceleration, slowing, retardation

a decrease in rate of change

"the deceleration of the arms race"

"slowing" in the verb sense

1. decelerate, slow, slow down, slow up, retard

lose velocity move more slowly

"The car decelerated"

2. slow, slow down, slow up, slack, slacken

become slow or slower

"Production slowed"

3. slow, slow down, slow up

cause to proceed more slowly

"The illness slowed him down"

Source: WordNet® (An amazing lexical database of English)

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