drive a wedge between A and B
drive a wedge between (someone or something)
To cause discord between two people or things. I used to be close friends with Tiffany, but once she started dating my ex-boyfriend, it really drove a wedge between us.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
drive a wedge between A and Bmake two people become less friendly or loving towards each other: The disagreements over money finally drove a wedge between them, and they ended up getting divorced.
A wedge is a piece of wood, metal, etc. with one thick end and one thin pointed end that you use to keep two things apart or to split wood or rock.
Farlex Partner Idioms Dictionary © Farlex 2017