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English definition of “oh”

oh

exclamation     /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 afraid I can't come to the party." " Oh, that's a shame." Is that for me? Oh, you're so kind! "I'm sorry I forgot to call you." "Oh, don't worry."Sounds used as interjectionsInterjections 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.Sounds used as interjectionsInterjections A1 used with other expressions of disappointment, sadness, anger, etc.: Oh dear, what a mess! Oh no, I've left my umbrella behind!Sounds used as interjectionsInterjections Grammar:OhSee moreGrammar:Oh as an interjectionWe use oh as an interjection to express surprise or disappointment:See moreGrammar:Oh as a discourse markerWe use oh as a discourse marker to respond to new information or to show that we have just discovered something surprising. We often use it with other discourse markers:See more
(Definition of oh exclamation from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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