To apply grease to something, often as a means of lubrication. A noun or pronoun can be used between "grease" and "up." If that door creaks every time you open it, you should really grease up the hinges.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
To coat something completely with grease; lubricate something with grease: The mechanic greased up the motor. At the fair, they greased the pigs up and then we chased them.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.