Hand in glove (with somebody) phrase
In close agreement, relationship, or collaboration with someone, often to do something dishonest, illegal, or immoral.
The two witnesses were hand in glove with each other in giving false evidence.
They are being suspected of working hand in glove with the terrorist network.
There is not a shred of evidence that the broker was hand in glove with the fraudulent vendor.
Used to indicate that helping each other or working together toward the same goal will have advantages for everyone who is involved
The more people working together on the same task, the easier it will be.
To make friends with or associate with those who are unpleasant or morally unacceptable
This phrase appeared earlier (in the late 17th century) as hand and glove ; the current form gained ground from the late 18th century.
To do domething based on your emotions rather than for rational reasons
I can't believe that Tom beat his classmate. He's always the one who let his heart rule his head.