American A: What is everyones’ opinion about how significant the indictment of Trump organization CFO is?
American B: Depends on what they have. If the DA shows that he has enough for a conviction...and indicates that he will go for a kill (including Weisellberg's kids)...he will flip.
Source: Online forum
What does "he will flip" mean? Usually if you flip a book, you mean to turn the book over. So I guess "he will flip" might mean "he will overthrow it"(Sorry I don't really know how to use the word "overthrow" since I don't know the meaning of "flip").