pour on coal

pour on coal

old-fashioned To increase one's speed, effort, or energy. An allusion to steam-powered locomotives, which uses a coal furnace to create steam that controls the train's speed. We're going to be merging onto the highway soon, so be sure to pour on coal before we reach the on ramp. What a come back! They've certainly poured on coal since halftime, haven't they?
See also: coal, on, pour

pour on coal

increase speed. US informal
The metaphor is based on the shovelling of more coal into a locomotive's furnace.
See also: coal, on, pour