so they say (simple past so they said, past participle so they had said)
Apparently, according to others.
As people move to the suburbs, bank branches follow, so they say.
Now I could let these dream killers kill my self esteem, Or use my arrogance as the steam to power my dreams I use it as my gas, so they say that I'm gassed But without it I'd be last, so I ought to laugh. Kanye West
Birds themselves are so interesting and intelligent, and they give so many cues without being verbal, so they say such great things. Feathers are superior to fur even. They're so beautiful and nature uses such amazing colors. Bibhu Mohapatra
Furniture manufacturing in plastics requires very costly machinery, which the Danish market is not big enough to justify. Or so they say. But show me a plastics manufacturer who dares to take on the experiment. Arne Jacobsen
Though we hear various reports of his existence we can never find the young wizard who is able so they say to graft the soul of a girl to the soul of her lover so that not even the sharp scissors of the Fates can ever sever them apart. Harry Crosby