eat through (something)
To erode or wear through something. Don't use that harsh cleaner—it will eat through a soft metal like this.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
(something) to erode all the way through something. The acid ate through the countertop and ruined everything in the drawers below. The vinegar ate through the top of the pickle jar.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.