To Slow Up Meaning. To arrive somewhere in order to join a group of people especially late or unexpectedly. You cant use it to form an opposite to slow down.
The phrasal verb speed up formed by adding the adverb up to the verb speed is the opposite of slow down. A list of slang words and phrases idioms jargon acronyms and abbreviations. Definition verb become slow or slower Synonyms.
You cant use it to form an opposite to slow down.
Idiomatic colloquial To slow slow down decelerate. Slow on the uptake. The government plans to slow their infrastructure investments up over the next year to help balance the federal budget. Prevent from proceeding on schedule or as planned.