I searched for a definition but couldn't find one. What is the meaning of the phrasal verb "to rip apart?"
It can have different meanings. The obvious one is that if you take a piece of fabric like cotton and tear it, you are ripping it apart.
The other meaning is for example in the case of a trial in court. The defendant is accused of murder, but claims that he was somewhere else at the time of the murder. His aliby would be "ripped apart" by the prosecuting attorney who could prove that the accused's aliby is not sound.