or else Meaning in the Cambridge English Dictionary
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Meaning of “or else” in the English Dictionary

"or else" in British English

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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 ​betterfind it ​quickly, or else (= or I will ​punish him in some way)!
(Definition of or else from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"or else" in American English

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or else

or: We’d ​better be there by eight or ​else we’ll ​miss the ​beginning. or else When or ​else is ​spoken at the end of a ​demand, it can also be a ​mildthreat: You’d ​betterremember to ​bring the ​babybottles this ​time, or ​else!
(Definition of or else from the Cambridge Academic Content Dictionary © Cambridge University Press)
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