Question

to be hand in glove (with someone) - Be careful what you say to John. He's hand in glove with the boss.  - Well, you know why he gave him the job. They're hand in glove!  - Max is always keen to talk up the idea that he and Bernie disagree and argue about lots of things, but fundamentally they’re hand in glove.  - The NFU (which over the years has been hand-in-glove with MAFF) also says it knows nothing about this.

Accepted Answer

to work closely with someone; to not have any secrets from someone

Idiom	to be hand in glove (with someone)
Definition	to work closely with someone; to not have any secrets from someone
Examples	- Be careful what you say to John. He's hand in glove with the boss. - Well, you know why he gave him the job. They're hand in glove! - Max is always keen to talk up the idea that he and Bernie disagree and argue about lots of things, but fundamentally they’re hand in glove. - The NFU (which over the years has been hand-in-glove with MAFF) also says it knows nothing about this.

Hand Glove Work Closely Secrets Careful John Boss