Ronda Rousey will straight-up QUIT the WWE if she loses to Becky Lynch and Charlotte Flair at WrestleMania this weekend ... so says The Man herself.
"She won't be able to hack it," Becky said of Ronda on "TMZ Live" on Friday ... "She won't be able to take it. She won't be able to look defeat in the face and say I can come back from this."
Becky says this has actually been her plan for MONTHS ... saying she's allowed Ronda to build up wins just so she can be the one that beats her and forces her to quit fighting for good.