SINCE 1828
or else
idiomDefinition of or else
1
—used to say what will happen if something is not done You have to leave or else you will be arrested for trespassing.
2
—used to say what another possibility is He either thinks he can't do it or else he just isn't interested.
3
informal
—used in angry speech to express a threat without saying exactly what the threat is Do what I say or else!
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Merriam-Webster unabridged
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