Definition
The phrase 'hand and glove' (similar to 'hand in glove') describes a very close and harmonious relationship, collaboration, or agreement. It's like peanut butter and jelly, or a perfect pair of socks – they just go together. The idea is of a perfect fit and seamless cooperation. Think of a well-oiled machine where all the parts work together without friction. It can sometimes imply a secret or illicit agreement, but not necessarily. It is the opposite of being at odds with each other.