Between the individuals, there are no masks. They have seen each other at their worst and remain unfazed. Modern Context
The ability to communicate through glances, half-sentences, or "inside jokes" that leave others in the room feeling like spectators. Thick as Thieves
At the heart of being "thick as thieves" is . It is rarely used to describe a large group; rather, it usually refers to a duo or a tiny inner circle. This closeness is often characterized by: Between the individuals, there are no masks