If someone or something is corrupt, they’re broken morally or in some other way. Corrupt people perform immoral or illegal acts for personal gain, without apology. Corrupt politicians take bribes and deny it.
When you corrupt someone, you convince them to do something wrong or even illegal. If you talk your little brother into stealing cookies from the cookie jar, you're corrupting him. Something corrupt is rotten, spoiled, or out of commission, like a file that makes your computer crash. A corrupt person — a criminal, a crook, or a cookie thief — brings society down with immoral and dishonest behavior. Corrupt goes back to the Latin roots cor-, "altogether," and rumpere, "break."