Definition of “or else” - English Dictionary

british 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 better find 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 mild threat:

You’d better remember to bring the baby bottles this time, or else!

(Definition of “or else” from the Cambridge Academic Content Dictionary © Cambridge University Press)