prune (something) of (something else)
To make something more trim, clean, or neat by pruning away that which is superfluous, undesirable, or unnecessary. I want to prune the tree outside of its dead and overgrown branches. As your career evolves, you'll need to start pruning your résumé of less relevant work experience.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
prune something of something
to clear, clean, or groom something of something by pruning. Sally was out in the orchard pruning the apple trees of dead branches. They pruned the roses of their unneeded branches.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.