1. Be persistent, refuse to stop
   "Despite the setbacks, she hung on with her research";
   - persevere, persist, hang in [informal], hold on
    
2. Fix to; attach
   "He hung on the new door handles";
   - append, tag on, tack on, tack
    
3. Hold the phone line open
   "Please hang on while I get your folder";
   - hold the line, hold on

Derived forms: hanging on, hung on, hangs on

Type of: attach, await, bear on, carry on, continue, expect, look, preserve, uphold, wait

Encyclopedia: Hang on