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Verb: slow up
  1. Become slow or slower
    "Production slowed up";
    - slow, slow down, slack, slacken
  2. Cause to proceed more slowly
    - slow, slow down
  3. Lose velocity; move more slowly
    "The car slowed up";
    - decelerate, slow, slow down, retard

Derived forms: slowing up, slowed up, slows up

Type of: decrease, diminish, fall, lessen, weaken