Crossword Genius

Common to both (6)

Ross

I believe the answer is:

mutual

(Other definitions for mutual that I've seen before include "Affecting both parties" , "Common to two or more" , "Joint < commonly" , "given and received" , "Held in common" .)

I've seen this clue in The Guardian.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.