pick up speed
1. Literally, to begin moving faster; to accelerate. The sled picked up speed as it slid down the hill.
2. To become more valuable. Don't sell your house just yet—homes in this area should pick up speed in the summer.
pick up speed
to increase speed. The train began to pick up speed as it went downhill. The car picked up speed as we moved into the left lane.
pick up ˈspeed
go faster: The train began to pick up speed.