interknow means to be mutually acquainted with. Lexicurio rates it Sui generis — a strength score of 88 out of 100.
Etymology
From inter- + know.
verb
- To be mutually acquainted with.“It is the only instrument by meanes whereof our wils and thoughts are communicated: it is the interpretour of our soules: If that faile us, we hold our selves no more, we enter-know one another no longer.”