slow up

Verb	1.	slow up - become slow or slower; "Production slowed" Synonyms: slacken, slow, slow down, slack
	2.	slow up - cause to proceed more slowly; "The illness slowed him down" Synonyms: slow, slow down
	3.	slow up - lose velocity; move more slowly; "The car decelerated" Synonyms: decelerate, slow, slow down, retard

bog, bog down, clog, constipate, decelerate, retard, slow, slow down