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Verb: mess with
Usage: informal
  1. Interfere with or tamper with something
    "Don't mess with my computer settings"
     
  2. Tease, annoy, or harass someone
    "Stop messing with your little sister"
     
  3. Engage in or experiment with something, often unwisely or dangerously
    "He started messing with drugs in college"

Derived forms: messed with, messes with, messing with