ouch expresses the feeling of physical pain or discomfort. It is usually used to express the pain caused by touching a part of the body that hurts or is in pain. It is an interjection and can also be used to express a disapproval or disinterest in a particular thing.
1. Ouch! I just burnt my hand on the stove.
2. Ouch, that comment really hurt me.
3. Ouch, I can feel the pain in my back after working out.
It is important to note that 'ouch' is a casual expression that should not be used in formal settings. Additionally, it is typically followed by an exclamation point (!). Care should be taken to not use 'ouch' to express sympathy for another person’s pain or discomfort, as it can be interpreted as insincere.