hand in hand

adverb3

1. •
   Holding or clasping hands.

   • The couple strolled down the sidewalk, hand in hand.
2. •
   (figurative) Naturally, ordinarily or predictably together; commonly having a correlation or relationship.

   • The tendency to follow trends and explore one's sense of self goes hand in hand with being a teenager.
3. •
   (no longer used) Just; fair; equitable.

   • As fair and as good, a kind of hand in hand comparison. — 1611