slow (sb/sth) down/up
phrasal verb with slow verb [ I or T ] uk/sləʊ/ us
to become slower or less active, or to make something slower or less active:
Growth in the business slowed down rather than increasing as expected.
slow down the pace/rate of sth US employers slowed down the pace of hiring last month.
"We see no signs of the demand slowing up," he said.