A zipper is a good example of interdigitate.
Interdigitate: I like this word. There's just something about it that I just can't put my finger on. Use it in a sentence if you can?
I am gonna interdigitate with Hippy's answer and agree with the zipper.
They know each other so well that their thoughts interdigitate effortlessly.
I like the word Interdigitate because it is a word with 5 syllables and hard sounds that one can wrap one's mouth around and chew on---all of which makes me feel like I have really said something when I use it.
(Perhaps you can relate?)