You use oh to introduce a response or a comment on something that has just been said.
[spoken]
'Had you seen the car before?'—'Oh yes, it was always in the drive.'
'Would you like me to phone and explain the situation?'—'Oh, would you?'
'You don't understand!'—'Oh, I think I do, Grace.'
2. exclamation
You use oh to express a feeling such as surprise, pain, annoyance, or happiness.
[spoken, feelings]
'Oh!' Kenny blinked. 'Has everyone gone?'
'Oh, my God,' Korontzis moaned.
Oh, I'm so glad you're here.
3. See also O
4. convention
You use oh when you are hesitating while speaking, for example because you are trying to estimate something, or because you are searching for the right word.
[spoken]
I've been here, oh, since the end of June.
They have destroyed the, oh, I don't know what the right word is – the atmosphere,the ambience.
oh in British English
(əʊ)
exclamation
1.
an exclamation expressive of surprise, pain, pleasure, etc
sentence connector
2.
an expression used to preface a remark, gain time, etc
oh, I suppose so
OH in British English
abbreviation for
Ohio
Ohio in British English
(əʊˈhaɪəʊ)
noun
1.
a state of the central US, in the Midwest on Lake Erie: consists of prairies in the W and the Allegheny plateau in the E, the Ohio River forming the S and most of the E borders. Capital: Columbus. Pop: 11 435 798 (2003 est). Area: 107 044 sq km (41 330 sq miles)
Abbreviation and zip code: OH
2.
a river in the eastern US, formed by the confluence of the Allegheny and Monongahela Rivers at Pittsburgh: flows generally W and SW to join the Mississippi at Cairo, Illinois, as its chief E tributary. Length: 1570 km (975 miles)
OH in American English
Ohio
oh in American English
(oʊ)
interjection
1.
used to express surprise, wonder, fear, pain, etc.
2.
used in direct address, as to attract attention
oh, waiter!
3.
used to signify comprehension or acknowledgment of another's statement, explanation, etc.