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English definition of “or else”

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 .Either, or, neither, nor 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 .Either, or, neither, nor informal used as a threat , sometimes humorously : He'd better find it quickly , or else (= or I will punish him in some way)!Dangers and threats Grammar:ElseGrammar:Else with someone, anybody, nobody, etc.We use else after words beginning with any-, every-, no- and some-, to mean ‘other’, ‘another’, ‘different’ or ‘additional’.Grammar:Else with who, what, where, etc.We use else after how, what, where, who and why to mean ‘other’, ‘another’, ‘different’ or ‘additional’:Grammar:Else: orelseWe use or else to say what the result will be if something does not happen:
(Definition of or else from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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