common ground

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common ground (uncountable)

1. (idiomatic) A characteristic or interest shared by multiple people or systems; any belief, etc. held in common.

   The first thing to do is to find common ground with the person you just met.

   • 1993 October 13, Todd Pipes, “Breakfast at Tiffany's”, in Home‎^[1], performed by Deep Blue Something, published 11 July 1995:

     You'll say, we've got nothing in common
     No common ground to start from
     And we're falling apart

• make common cause