hand in glove
In close association or collaboration (with someone or something). Our art and marketing departments always work hand in glove to make sure all the campaigns are consistently designed. It turns out that the doctor and the pharmaceutical company have been hand in glove for years, conspiring together to push expensive medications on patients regardless of their actual need.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
mod. suiting one another naturally. These two go hand-in-glove.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.