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Wiktionary
slow up

vb. (context idiomatic colloquial English) To slow, slow down, decelerate.

WordNet
slow up
  1. v. become slow or slower; "Production slowed" [syn: slow, slow down, slack, slacken]

  2. cause to proceed more slowly; "The illness slowed him down" [syn: slow, slow down]

  3. lose velocity; move more slowly; "The car decelerated" [syn: decelerate, slow, slow down, retard] [ant: accelerate]

Usage examples of "slow up".

It's sufficient to say that Sulu was drugged in order to slow up Kirk, should Kirk decide to leave suddenly.

Their purpose would be to slow up and misdirect the Posleen while military police backed by light armor would be rounding up, and in some cases driving, the refugees.

For the first time in their long alliance, Reggie was moved to bid Sam slow up.