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English definition of “or else”

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or else

B2 used to say what will happen if another thing does not happen: We must be there by six, or else we'll miss the beginning. B2 used to compare two different things or situations: She's either really talkative and you can't shut her up or else she's silent. informal used as a threat, sometimes humorously: He'd better find it quickly, or else (= or I will punish him in some way)!
(Definition of or else from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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SMART Thesaurus: Either, or, neither, nor

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