Related Clues:
- Decide who is out of bounds
- Red card issuer, for short
- Ring official, for short
- Round dance caller
- Whistleblower (abbr)
- Person keeping track of progress, familiarly
- World Cup official
- Call, as a game, briefly
- Tosser of a jump ball
- Soccer official, for short
- Bowl game whistler
- NBA whistle blower
- Prompter?
- Coin flipper at the Super Bowl, informally
- Sports monitor, for short