To have common ground with someone or something it means opinions or interests are shared by each of two or more parties.
Something that people agree about even if they disagree about other things.
A basis of mutual interest or agreement.
1. Well, it seems that the only common ground you and I share is my son.
2. The jury voted but could not find common ground on the final verdict.
3. The country is struggling to find common ground on issues on abortion, gun control, and gay marriage.
4. When I went to France to study abroad, the only common ground I had was my love of wine and cheese.
area of agreement, commonalities, communion, community, mutual understanding, mutuality