hand in hand
hand in hand {adv. phr.}
1. Holding hands.
Bob and Mary walked along hand in hand in the park.
Compare: ARM IN ARM.
2. Accompanying each other; together; closely connected. — Used with "go".
Ignorance and poverty often go hand in hand.
Selfishness and unhappiness often go hand in hand.
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Source: A Dictionary of American Idioms