Can a cleric "multi class" between domains? [duplicate]

I have a player asking me if there is a mechanic that would allow them to take on a second domain, much in the same way a player can multi class. My gut here is no and I am contemplating instead finding out which 2 domains they wish to combine and then forming my own homebrew deity and domain that takes aspects of each, but not everything. But is there a RAW way that a player could take on multiple domains as a cleric?