slow-up

(verb) become slow or slower. Synonyms: slow, slow down, slow up, slack, slacken. Example: "Production slowed."

(verb) cause to proceed more slowly. Synonyms: slow, slow down, slow up. Example: "The illness slowed him down."

(verb) lose velocity; move more slowly. Synonyms: decelerate, slow, slow down, slow up, retard. Example: "The car decelerated."