1. A person or thing brought in as a substitute or ringer, especially in a deceptive or unauthorized manner
   "The team was accused of using ring-ins for the championship game"
    
2. An outsider or newcomer, especially one who is not entirely welcome
   "As the new guy in town, he felt like a ring-in at the local pub"

1. Announce or herald the arrival or beginning of something
   "The new year was rung in with fireworks and celebrations"
    
2. [Brit] Telephone someone, especially in a work context
   "Can you ring in to the office and let them know I'll be late?"
    
3. [Brit] Record one's arrival at work, typically by using a timeclock or similar system
   "He always rings in at exactly 9 AM"

Derived forms: rang in, ring-ins, ringing in, rings in, rung in