2
general::
Phrase(s): Break it up!
Stop fighting!; Stop arguing! (Fixed order.) • Tom: I’m going to break your neck! Bill: I’m going to mash in your face first! Bob: All right, you two, break it up! • When the police officer saw the boys fighting, he came over and hollered, "Break it up! You want me to arrest you?"
McGrawhill's American Idioms And Phrasal Verbs