Between
/bɪˈtwiːn/
noun
A kind of needle, shorter than a sharp, with a small rounded eye, used for making fine stitches on heavy fabrics.
preposition
In the position or interval that separates (two things), or intermediate in quantity or degree. (See Usage notes below.)
“I want to buy one that costs somewhere between forty and fifty dollars.”
Done together or reciprocally.
“conversation between friends”
Shared in confidence.
“Between you and me, I think the boss is crazy. Let's keep this between ourselves.”