1 [+papel, tejido] to tear; rip; [+vidrio, cerámica] to crack; [+neumático] to get ripped se le rajaron las ruedas al chocar
2 (echarse atrás) to back out (familiar) no te irás a rajar ahora que tenemos las entradas you are not going to back out now we've got the tickets; ¡me rajé! (Latinoamérica) that's enough for me!; I'm quitting!