Antonio Brown is threatening Ryan Clark with violence if his former teammate doesn't stop talking about him ... telling the ex-Steelers DB, "next time we meet it’s on site ain’t gone spare u."
Remember, Clark and AB have been going at it for months ... 'cause Ryan -- who's now an ESPN analyst -- was critical of the WR while his drama in Pittsburgh was all unfolding in the winter.
At the time, Ryan said Brown and the Steelers needed to part ways because of AB's antics ... and Antonio famously fired back, calling Clark an "Uncle Tom.