Oh definition

Particularly in the context of internet conversations, "oh" is sometimes written with additional Os or Hs - for example, oooh or ohhh.

Expression of surprise.

Oh! I didn't see you there.
Expression of wonder, amazement, or awe.

Oh, wow! That's amazing.
Expression of understanding, recognition, or realization.

Oh, so that's how it works.
A word to precede an offhand or annoyed remark.

Oh, leave me alone.
A word to precede an added or comment or afterthought.

Oh, and don't forget your coat.
An invocation or address (similar to the vocative in languages with noun declension).

Oh, gosh
Exclamation for drama or emphasis (often poetic).

Oh, when will it end?
Expression of pain. See ouch.

Oh! That hurt.
Space filler or extra syllable, especially in (popular) music.

oh, oh, oh
Used with a term of endearment.

Oh baby