Crossword Genius

". . . or ___!" (ultimatum words) (4)

Ross

I believe the answer is:

else

(Other definitions for else that I've seen before include "Eels (anag)" , "Adverb meaning if not, otherwise" , "Otherwise; different from" , "Besides; instead" , "Besides; different" .)

I've seen this clue in the USA Today.
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