Definition of do anything
1 : to take an action that is considered wrong or suspicious or of particular interest If he does anything, let me know. —often used in negative statements "Why is she mad?" "I don't know. I didn't do anything."
2 : to be occupied with something I need to start dinner, but I can't do anything until you get out of the way. If you're not doing anything this evening, why not come over for dinner?