oh Meaning in the Cambridge English Dictionary
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Meaning of “oh” in the English Dictionary

"oh" in British English

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ohexclamation

uk   /əʊ/  us   //
A1 used to ​express different ​emotions, such as ​surprise, ​disappointment, and ​pleasure, often as a ​reaction to something someone has said: "He's been ​married three ​times." "Oh, really? I didn't ​know that!" "I'm ​sorry I can't come to the ​party." " Oh, too ​bad!" Is that for me? Oh, that's so ​sweet! "I'm ​sorry I ​forgot to ​call you." "Oh, don't ​worry."A1 introduces an ​idea that you have just ​thought of, or something that you have just ​remembered: Oh, I've just ​thought of a ​problem. Oh, and don't ​forget to ​lock the back ​door.A1 used with other ​expressions of ​disappointment, ​sadness, ​anger, etc.: Oh ​dear, what a ​mess! Oh no, I ​left my ​umbrella behind!
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ohnoun [C]

(also o) uk   /əʊ/  us   //
sometimes used in writing for the ​number zero: My ​phonenumber is five, ​double oh, seven, six, six.
written abbreviation for the US ​state of Ohio: used in ​addresses
(Definition of oh from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"oh" in American English

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ohexclamation

 us   //
used to ​express a ​variety of ​emotions, such as ​surprise and ​pleasure, often as a ​reaction to something someone has said: Oh, I didn’t ​know they were ​married. Oh, really?
(Definition of oh from the Cambridge Academic Content Dictionary © Cambridge University Press)
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