get away with murder
US /ɡɛt əˈweɪ wɪð ˈmɜːrdər/
UK /ɡɛt əˈweɪ wɪð ˈmɜːrdər/

1.
salirse con la suya, quedar impune
to do something very bad or wrong and not be punished for it
:
•
He's always late, but because he's the boss's son, he seems to get away with murder.
Siempre llega tarde, pero como es el hijo del jefe, parece que se sale con la suya.
•
Some students try to get away with murder by cheating on exams, but they usually get caught.
Algunos estudiantes intentan salirse con la suya haciendo trampa en los exámenes, pero generalmente los atrapan.