Hand In Glove

The phrase “hand in glove” means very close cooperation or partnership, usually in a way that’s smooth, coordinated, or sometimes even too close.

It can be positive (working together seamlessly) or negative (collusion, being too closely involved).

• The designers worked hand in glove with the engineers to finish the project. (positive teamwork)
• The corrupt officials were hand in glove with the smugglers. (negative, secret cooperation)