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1. Fix to; attach
   - append, tag on, tack on, tack
    
2. Be persistent, refuse to stop
   - persevere, persist, hang in, hold on
    
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