Oof
noun
A sound made in pain, as when expelling air after being struck.
interjection
A sound mimicking the loss of air, as if someone's solar plexus had just been struck.
interjection
An expression of one's own physical pain.
“Ouch! You stepped on my toe! That hurt!”
An expression in sympathy at another's pain.
“Ouch! Her sunburn looks awful.”
A reply to an insult seen as savage (frequently one that is tongue-in-cheek or joking).
“Ouch. How could you say that?”