To Slow Up Meaning. Slow on the uptake. Slow up means the same as slow down 1.
The government plans to slow their infrastructure investments up over the next year to help balance the federal budget. Registering behind or below what is correct the clock is slow. Sales are slowing up.
You cant use it to form an opposite to slow down.
Slow or unable to understand something. Idiomatic colloquial To slow slow down decelerate. Having qualities that hinder rapid progress or action a slow track. He or she is very sensitive and somewhat withdrawn.