1
general::
Phrase(s): or else
or suffer the consequences. (An inspecific threat of bad consequences.) • Do what I tell you, or else. • Don’t be late for work, or else!
McGrawhill's American Idioms And Phrasal Verbs
2
general::
1. Otherwise, in different circumstances, as in Present your case now, or else you won't have a chance. [c. 1300] 2. Regardless of any extenuating circumstances, no matter what, as in Be there on time or else! [Second half of 1800s]
American Heritage Idioms