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together; mutually; fellow
「相」 has other readings with different meanings.
彼の人相は穏やかで親しみやすい。
His facial appearance is gentle and approachable.
占い師が手相を見てくれることになった。
A fortune teller was going to read my palm.
この家は家相がとても良いらしいです。
Apparently this house has very good feng shui.