To Slow Up Meaning. Prevent from proceeding on schedule or as planned. Sales are slowing up.
The phrasal verb slow up is used in certain regions and by certain people and it is often shown in lists of phrasal verbs but it makes no sense to me at all nor. The illness slowed him down slow slow down bog bog down - cause to slow down or get stuck. Slow or unable to understand something.
The government plans to slow their infrastructure investments up over the next year to help balance the federal budget.
COBUILD Advanced English Dictionary. Prevent from proceeding on schedule or as planned. Definition verb become slow or slower Synonyms. A marked decline in activity.