buff up
Intermediário (B1) informal
To make something shiny by rubbing it — or to build big muscles at the gym.
"He spent the afternoon buffing up his motorbike until he could see his reflection in the fuel tank."
To make something shiny by rubbing it — or to build big muscles at the gym.
"He spent the afternoon buffing up his motorbike until he could see his reflection in the fuel tank."