How does anti change a word?

"Anti" is a prefix that means against, opposite of, or contrary to. It's used to create new words with the opposite meaning of the original word.

Here are some examples:

* Anti-social: Opposite of social, meaning not enjoying or avoiding social interaction.

* Antibiotic: A substance that works against bacteria.

* Anti-gravity: Contrary to gravity, suggesting a force that would oppose the effects of gravity.

* Anti-war: Against war, advocating for peace.

* Anti-depressant: A medication that works against depression.

So, "anti" changes a word by adding a negative or opposing meaning to it.