desensitize (someone or something) to (something)
To lessen the effect that something has on someone or something. People blame video games for desensitizing kids to violence. This special toothpaste should desensitize to your teeth to cold beverages.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
desensitize someone to something
to make someone less sensitive to something. The doctor wanted to desensitize the allergic child to pollen. I took injections to desensitize me to house dust.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.